#include<stdio.h>
int main()
{
    int n;
    int a,b,c;
    int avg=0;
    int count=0;
    scanf("%d\n",&n);
    while(scanf("%d %d %d",&a,&b,&c)!=EOF)
    {
        avg=(a+b+c)/3;
        if(avg<60)
            count ++;
    }
    printf("%d\n",count);
    
}