#include <stdio.h>

int main() {
    int n, avg, count = 0;
    int c, m, e;
    scanf("%d",&n);
    for (int i = 0; i < n; i++) {
        scanf("%d %d %d",&c,&m,&e);
        avg = (c+m+e)/3;
        if (avg < 60)
            count += 1;
    }
    printf("%d", count);
    return 0;
}