#include<bits/stdc++.h> using namespace std; typedef long long LL; int main() { LL n; cin>>n; int ans=-1; for(int i=1;i<=100;i++) { LL t=1; for(int j=1;j<=i;j++) { t=t*i; } if(t==n) { ans=i; break; } } cout<<ans; return 0; }
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