import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    }
} Main public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    } main {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int n = scan.nextInt(); n scan.nextInt() scan.nextInt scan for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        } int i = 111; int i = 111; i 111 i < 1000 i 1000 i += 111 i += 111 i 111 {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        } {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        } if(i >= n) {
        		System.out.println(i);
        		return;
        	} i >= n i n {
        		System.out.println(i);
        		return;
        	} System.out.println(i) System.out.println System.out System System.out i return; String[] args args public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        for(int i = 111; i < 1000; i += 111) {
        	if(i >= n) {
        		System.out.println(i);
        		return;
        	}
        }
    }
}