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

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

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