// I love CCF!
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n = 0, L = 0, R = 0;
    cin >> n >> L >> R;
    int i = 0;
    for (i = n; i <= R; i += n);
    i -= n;
    int k = (i == n) ? R : (i - 1);
    cout << k % n << endl;
    return 0;
}