import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
	static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	}

} Main public static void main(String[] args) {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	} main {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	} FastReader ob = new FastReader(); ob new FastReader() long n=ob.nextLong() n ob.nextLong() ob.nextLong ob a=ob.nextLong() a ob.nextLong() ob.nextLong ob b=ob.nextLong(); b ob.nextLong() ob.nextLong ob long q=n/(a+b) q n/(a+b) n (a+b) a b r=n%(a+b); r n%(a+b) n (a+b) a b long ans=(q*a); ans (q*a) q a if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		} a<r a r {
			ans+=a;
		} ans+=a ans a if(a>=r && a!=0) {
			ans+=r;
		} a>=r && a!=0 a>=r a r a!=0 a 0 {
			ans+=r;
		} ans+=r ans r System.out.println(ans) System.out.println System.out System System.out ans String[] args args static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	} FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		} FastReader {
			br =  new BufferedReader(new InputStreamReader(System.in));
		} br =  new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		} next {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		} while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			} st==null || !st.hasMoreElements() st==null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			} try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				} catch(IOException e) {
					e.printStackTrace();
				} IOException e {
					e.printStackTrace();
				} e.printStackTrace() e.printStackTrace e {
					st = new StringTokenizer(br.readLine());
					
				} st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
			return Integer.parseInt(next());
		} nextInt {
			return Integer.parseInt(next());
		} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
			return Long.parseLong(next());
		} nextLong {
			return Long.parseLong(next());
		} return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next public class Main {
	static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	}

} public class Main {
	static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	}

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	static class FastReader{
		BufferedReader br;
		StringTokenizer st;
		public FastReader() {
			br =  new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			while(st==null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
					
				}
				catch(IOException e) {
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	public static void main(String[] args) {
		FastReader ob = new FastReader();
		long n=ob.nextLong(),a=ob.nextLong(),b=ob.nextLong();
		long q=n/(a+b),r=n%(a+b);
		long ans=(q*a);
		if(a<r) {
			ans+=a;
		}
		else if(a>=r && a!=0) {
			ans+=r;
		}
		System.out.println(ans);
		
	}

}
