#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    long long l, r, m;
    cin >> l >> r >> m;
    if (m == 1) {
        cout << 0 << '\n';
        return 0;
    }
    vector<long long> fac(m, 1);
    for (int i = 2; i < m; i++) {
        fac[i] = fac[i - 1] * i;
        fac[i] %= m;
    }
    vector<long long> pre(m, 1);
    for (int i = 2; i < m; i++) {
        pre[i] = pre[i - 1] * fac[i];
        pre[i] %= m;
    }
    if (l >= m) {
        cout << 0 << '\n';
    } else {
        r = min(r, m - 1);
        long long ans = 0;
        for (long long i = l; i <= r; i++) {
            ans += pre[i];
            ans %= m;
        }
        cout << ans << '\n';
    }
}