#include<stdio.h>
int main()
{
    int n;
    scanf("%d", &n); 
   int scores[3];
    int count=0;
while(n--){
     scanf("%d %d %d", &scores[0], &scores[1], &scores[2]);
        int avg = (scores[0] + scores[1] + scores[2]) / 3;
        if (avg < 60) 
            count++;
    
    
}printf("%d\n",count);
}