#include <stdio.h>

int main() {
    int a = 0;
int z = 0;
int x = 0;
int c = 0;
int v = 0;
int b = 0;

    scanf("%d",&a);
    for(int n = 0;n<a;n++)
    {
 scanf("%d %d %d",&z,&x,&c);
int v = (z+x+c)/3;
if(v<60)
{
    b++;
}
    }
    printf("%d",b);
    return 0;
}