#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)

int main() {
	ll a, b, c;
	cin >> a >> b >> c;
	a++;
	vector<ll> p(c), s(c + 1, 0);
	rep(i, c) p[i] = pow_mod(i, b, c);
	rep(i, c) s[i + 1] = (s[i] + p[i]) % c;
	cout << (s[c] * (a / c) + s[a % c]) % c << endl;
	return 0;
}