PSR

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int n,S=0;
    long double A;
    unsigned long long int R;
    cin>>n;
    while(n--)
    {
        cin>>A>>R;
        if((unsigned long long int)sqrt(A*(A+1)*(A+2)*(A+3)+1)==R)
           ++S;
    }
    cout<<S;
    return 0;
}