救命！！！最后四个！！！

#include<bits/stdc++.h>
using namespace std;
int main(){
    unsigned long long n,o=1;
    cin>>n;
    unsigned long long rr=sqrt(n*o);
    while(rr!=sqrt(n*o)){
        o+=1;
        rr=sqrt(n*o);
    }
    cout<<o;
}