#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

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