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#include<iostream>
using namespace std;
int main(){
    int n,a;
    cin >> n;
    for(int i = 2;i<=n-1;i++){
        if(n%i==0){
            a = i;
            break;
        }
    }
    if(a>n/a){
        cout << a;
    }else{
        cout << n/a;
    }
}