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

long long f[1001001];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    long long L,R;
    int M;
    cin >> L >> R >> M;
    long long tmp = 1;
    f[0] = 1;
    for(int i = 1; i <= M; i++) {
        tmp = tmp*i%M;
        f[i] = (f[i-1]*tmp)%M;
    }
    long long ans = 0;
    for(long long i = L; i <= min(R,(long long)M); i++) {
        ans += f[i];
        ans %= M;
    }
    cout << ans << endl;
}