#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

void solve() {
  unsigned long long W, D;
  cin >> W >> D;
  while (D > 1) {
    W -= W / (D * D);
    D--;
  }
  cout << W << endl;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  solve();
  getchar();
}