#include using namespace std; using ll=long long; using vin=vector; using vll=vector; using vvin=vector>; using vvll=vector>; using vstr=vector; using vvstr=vector>; using vch=vector; using vvch=vector>; using vbo=vector; using vvbo=vector>; using vpii=vector>; using pqsin=priority_queue,greater>; #define mp make_pair #define rep(i,n) for(int i=0;i<(int)(n);i++) #define rep2(i,s,n) for(int i=(s);i<(int)(n);i++) #define all(v) v.begin(),v.end() #define decp(n) cout< pf; queue q; void prime_factor(int n){ for(int i=2;i*i<=n;i++){ if(n%i==0)q.push(i); while(n%i==0){ pf[i]++; n/=i; } } if(n!=1){ pf[n]++; q.push(n); } return; } int main(){ int n;cin>>n; prime_factor(n); int b=1; while(q.size()){ auto p=q.front();q.pop(); if(pf[p]%2)b*=p; } cout<