#include <stdio.h>

int main() {
    int N;
    scanf("%d", &N);

    int A[N];
    for (int i = 0; i < N; i++) {
        scanf("%d", &A[i]);
    }

    long long count = 0;
    int prefix = 0;

    
    int freq[2500001] = {0};

    freq[0] = 1; 

    for (int i = 0; i < N; i++) {
        prefix += A[i];

        if (prefix >= 47) {
            count += freq[prefix - 47];
        }

        freq[prefix]++;
    }

    printf("%lld\n", count);

    return 0;
}