#include<cstdio>
#include<cstdlib>
int main(void){
int x;
int n=0;
scanf("%d",&x);
while(x>0){
--x;
int v,t;
scanf("%d%d",&v,&t);
if(v>168&&t>63){
n=n+1;
}}
printf("%d",n);
return EXIT_SUCCESS;
}
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