#include<iostream>
using namespace std;
int main(){
    int N,sup=0;
    cin >> N;
    if(N%2 == 1){
        cout << N << endl;
        return 0;
    }
    for(int i=N-1;i >= N/2;i += 2){
        if(N%i == 0) cout << i << endl;
        return 0;
    }
    cout << 1 << endl;
    return 0;
}