#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a, b;
  cin >> n >> a >> b;
  int ans = a;
  if (b < 0) {
    int t = abs(b);
    while (t--) {
      --a;
      if (a == 0) a = n;
    }
  } else {
    while (b--) {
      ++a;
      if (a == n + 1) a = 1;
    }
  }
  cout << a << endl;
}
