#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);
}

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