#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int cnt;
int main()
{
int n;
scanf("%d", &n);
for (int i = 1; i <= n; i ++ )
{
int a, b;
scanf("%d%d", &a, &b);
int res = a * 5 - b * 3;
if(res > 40)
{
cnt ++;
}
}
if(cnt == n)
{
printf("%d+", cnt);
}else
{
printf("%d", cnt);
}
return 0;
}