#include <iostream>

using namespace std;

int main() {
    long long n, l, r;
    cin >> n >> l >> r;
    if ((l % n + (r - l)) >= n) {
        cout << n - 1 << endl;
    } else {
        cout << max(l % n, r % n) << endl;
    }
    return 0;
}

#include <bits/stdc++.h>

using namespace std;
#define endl '\n';

void coder_solution();

int main() {
    // 小码匠
    coder_solution();

    return 0;
}

bool is_prime(long long x) {
    if (x < 2) {
        return false;
    }

    for (long long i = 2; i * i <= x; i++) {
        if (x % i == 0) {
            return false;
        }
    }
    return true;
}

void coder_solution() {
    // 提升cin、cout效率
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    // 输入
    long long n;
    cin >> n;
    vector<long long> vi;
    int loop_count = cbrt(n);
    vector<bool> tf(1000001, true);
    tf[0] = false;
    tf[1] = false;
    vi.push_back(2);

    for (int i = 3; i <= loop_count; i += 2) {
        if (tf[i]) {
            for (int j = 3; j * i <= loop_count; j += 2) {
                tf[j * i] = false;
            }
            vi.push_back(i);
        }
    }
    int len = vi.size();
    int ans = 0;
    for (int i = 0; i < len - 1; ++i) {
        for (int j = i + 1; vi[j] * vi[j] * vi[j] <= n / vi[i] && j < len; ++j) {
            ans++;
        }
    }
    cout << ans;
}

D:\>cd \tools\CodeBlocks\MinGW\bin

D:\tools\CodeBlocks\MinGW\bin>dir gdb*
 驱动器 D 中的卷没有标签。
 卷的序列号是 B84A-DA49

 D:\tools\CodeBlocks\MinGW\bin 的目录

2018/05/12  15:28            59,605 gdb.exe
2018/05/12  15:28         9,594,561 gdborig.exe
2018/05/12  15:28           506,436 gdbserver.exe
               3 个文件     10,160,602 字节
               0 个目录 153,524,097,024 可用字节


D:\tools\CodeBlocks\MinGW\bin>gdb
GNU gdb (GDB) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-w64-mingw32".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb)