#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a, b;
  cin >> n >> a >> b;
  if (b) b = (b / abs(b)) * (abs(b) % n);
  if (!b) {
    cout << a;
    return 0;
  }
  if (b > 0) {
    int i, cnt = 0;
    for (i = a; cnt != b; (i != n) ? (i++) : i = 1) {
      cnt++;
    }
    cout << i;
    return 0;
  }
  if (b < 0) {
    b = abs(b);
    int i, cnt = 0;
    for (i = a; cnt != b; (i != 1) ? (i--) : i = n) {
      cnt++;
    }
    cout << i;
    return 0;
  }
}
