#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (int i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (int i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)

int main() {
    int n, k, ans;
    cin >> n >> k;
    REP (i,1,n-1) if (n % i == 0) ans = i;
    cout << ans << endl;
    return 0;
}