#include <bits/stdc++.h>
using namespace std;

int main()
{
	int64_t l, r, m;
	cin >> l >> r >> m;
	
	vector<int64_t> fact(m);
	fact[0] = 1;
	for(int64_t i = 1; i < m; i++) fact[i] = (fact[i - 1] * i) % m;
	
	int64_t ans = 0;
	int64_t rui = 1;
	if(m <= l)
	{
		cout << 0 << endl;
		return 0;
	}
	for(int64_t i = 1; i < l; i++)
	{
		rui *= fact[i];
		rui %= m;
	}
	for(int64_t i = l; i <= r; i++)
	{
		if(m <= i) break;
		rui *= fact[i];
		rui %= m;
		ans += rui;
		ans %= m;
	}
	cout << ans << endl;
	return 0;
}