#include <stdio.h>

int main() {
    int sum;
    int a,b,c,i=1,all=0;
    scanf("%d",&sum);
    while(i<=sum){
        scanf("%d%d%d",&a,&b,&c);
        if((a+b+c)/3<60){
            all+=1;
        }
        i++;
    }
    printf("%d",all);
    return 0;
}