#include <stdio.h> int main() { int n,m=0,a,b,c; float d; scanf("%d\n",&n); while(scanf("%d %d %d\n",&a,&b,&c)==3)//多组输入 { d=(a+b+c)/3.0; if(d<60) m++; } printf("%d\n",m); return 0; }