#include <iostream>
using namespace std;
using ll = long long;


int main(void) {
	ll l, r, m;	cin >> l >> r >> m;
	
	if (l >= m) {
		cout << 0 << endl;
		return 0;
	}

	r = min(r, m - 1);
	ll a = 1, b = 1;
	for (ll i = 2; i < l; i++) {
		a *= i;	a %= m;
		b *= a;	b %= m;
	}
	ll ans = 0;
	for (ll i = l; i <= r; i++) {
		a *= i;	a %= m;
		b *= a;	b %= m;
		ans += b;	ans %= m;
	}
	cout << ans << endl;

	return 0;
}