#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <math.h>
#include <vector>
#include <queue>
#include <algorithm>
#include <sstream>
#include <string>
#include <map>
#include <math.h>
#include <time.h>

using namespace std;

#define FOR(I,N) for(int I = 0; I < (int)(N); I++)
#define FIN(V) cout<<V<<endl
#define pb push_back
#define INF (1 << 30)
#define ll long long

typedef pair<int, int> P;

string sValueOf(int v){stringstream ss;ss<<v;return ss.str();}
int parseInt(string v){int i;stringstream ss(v);ss>>i;return i;}
void fast_io() {cin.tie(0); ios::sync_with_stdio(false);}

int main(){
	int i,j;
	ll X,next;
	ll Y = 1;
	cin>>X;
	while(true){
		next = X*Y;
		long long l = 0;
		long long r = 1000000000;
		bool can = false;
		long be = -1;
		while(r>l){
			long long tar = ((r-l)/2)+l;
			if(tar==be)break;
			if(tar*tar==next){can = true;break;}
			if((tar*tar)>next){///越えてる
				r = tar;
			}else{///越えてない
				l = tar;
			}
			be = tar;
		}
		if(can)break;
		Y++;
		if(Y>1000000){Y = X;break;}
	}
	///cout<<clock()-s<<endl;
	cout<<Y<<endl;
	return 0;
}