#include<iostream>
#include<vector>
#include<utility>
#include<map>
#include<deque>
#include<numeric>
#include<algorithm>
#include<unordered_map>
#include<cmath>
#include<string>
#include<iomanip>

using namespace std;

using ll = long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define per(i, b) per2(i, 0, b)
#define per2(i, a, b) for (int i = int(b) - 1; i >= int(a); i--)
#define ALL(c) (c).begin(), (c).end()
#define SZ(x) ((int)(x).size())

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }

template <class T, class U>
void chmin(T& t, const U& u) {
	if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
	if (t < u) t = u;
}

template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
	os << "(" << p.first << "," << p.second << ")";
	return os;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
	os << "{";
	rep(i, v.size()) {
		if (i) os << ",";
		os << v[i];
	}
	os << "}";
	return os;
}

template <unsigned int MOD>
struct ModInt {
	using uint = unsigned int;
	using ull = unsigned long long;
	using M = ModInt;

	uint v;

	ModInt(ll _v = 0) { set_norm(_v % MOD + MOD); } //コンストラクタ
	M& set_norm(uint _v) {  //[0, MOD * 2)->[0, MOD)
		v = (_v < MOD) ? _v : _v - MOD;
		return *this;
	}

	explicit operator bool() const { return v != 0; }
	M operator+(const M& a) const { return M().set_norm(v + a.v); }
	M operator-(const M& a) const { return M().set_norm(v + MOD - a.v); }
	M operator*(const M& a) const { return M().set_norm(ull(v) * a.v % MOD); }
	M operator/(const M& a) const { return *this * a.inv(); }
	M& operator+=(const M& a) { return *this = *this + a; }
	M& operator-=(const M& a) { return *this = *this - a; }
	M& operator*=(const M& a) { return *this = *this * a; }
	M& operator/=(const M& a) { return *this = *this / a; }
	M operator-() const { return M() - *this; }
	M& operator++(int) { return *this = *this + 1; }
	M& operator--(int) { return *this = *this - 1; }

	M pow(ll n) const {
		if (n < 0) return inv().pow(-n);
		M x = *this, res = 1;
		while (n) {
			if (n & 1) res *= x;
			x *= x;
			n >>= 1;
		}
		return res;
	}

	M inv() const {
		ll a = v, b = MOD, p = 1, q = 0, t;
		while (b != 0) {
			t = a / b;
			swap(a -= t * b, b);
			swap(p -= t * q, q);
		}
		return M(p);
	}

	bool operator==(const M& a) const { return v == a.v; }
	bool operator!=(const M& a) const { return v != a.v; }
	friend ostream& operator<<(ostream& os, const M& a) { return os << a.v; }
	static uint get_mod() { return MOD; }
};

ll n;
ll x, m;
vector<ll> sum;
map<ll, ll> memo;

bool f() {
	static ll i = 1;
	if (!memo[x]) {
		memo[x] = i;
		i++;
		sum.push_back(sum.back() + x);
		x = (x * x) % m;
		return true;
	}
	else {
		return false;
	}
}

int main(void) {
	cin >> n >> x >> m;
	sum.push_back(0);
	ll i;
	for (i = 0; i < n; i++) {
		if (!f())
			break;
	}
	ll start = memo[x];
	if (i == n)
		start = 1;
	ll stop = i;
	ll l = stop - start + 1;
	ll num = (n - start + 1) / l;
	ll num_mod = (n - start + 1) % l;
	ll ret = sum[start - 1];
	ret += (sum[stop] - sum[start-1]) * num;
	ret += sum[start + num_mod -1] - sum[start-1];

	cout << ret << endl;
	return 0;
}

Measured memory_bytes: 6684