#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n, a, m;
  cin >> n >> a >> m;
  m %= n;
  a += m;
  if (a < 0) {
    a = n + a;
  }
  a %= n;
  if (a == 0) a = n;
  cout << a;
  return 0;
}
