// 愚直解

#include <bits/stdc++.h>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
using namespace std;
using ll = long long;


int main(void) {
	ll l, r, m;	cin >> l >> r >> m;

	ll ans = 0ll;
	rep(n, l, r + 1) {
		ll a = 1ll;
		rep(i, 1, n + 1) {
			ll b = 1ll;
			rep(j, 1, i + 1) {
				b *= j;
				b %= m;
			}
			a *= b;
			a %= m;
		}
		ans += a;
		ans %= m;
	}
	cout << ans << endl;

	return 0;
}