import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;

public class Main{

	public static void main(String[] args) {
		FastScanner stdIn = new FastScanner();
		PrintWriter out = new PrintWriter(System.out);
		
		int n = stdIn.nextInt();
		int[] a = new int[n];
		for(int i = 0; i < n; i++) {
			a[i] = stdIn.nextInt();
		}
		long[] s = new long[n+1];
		s[0] = 0;
		for(int i = 1; i < n+1; i++) {
			s[i] = s[i-1]+a[i-1];
		}
		Map<Long,Long>map = new HashMap<>();
		
		for(int i = 0; i < n+1; i++) {
			if(map.containsKey(s[i])) {
				map.put(s[i],map.get(s[i])+1);
			}else {
				map.put(s[i],(long)1);
			}
		}
		long ans = 0;
		
		for(long k: map.keySet()) {
			ans += map.get(k)* (map.get(k)-1)/2;
		}
		out.println(ans);
		out.flush();
	}

}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}