#include<bits/stdc++.h>
#include<atcoder/all>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long> vl;
typedef vector<vector<int>> vvi;
typedef vector<vector<long long>> vvl;
typedef long double ld;
typedef pair<int, int> P;

template <int m> ostream& operator<<(ostream& os, const static_modint<m>& a) {os << a.val(); return os;}
template <int m> ostream& operator<<(ostream& os, const dynamic_modint<m>& a) {os << a.val(); return os;}
template <int m> istream& operator>>(istream& is, static_modint<m>& a) {long long x; is >> x; a = x; return is;}
template <int m> istream& operator>>(istream& is, dynamic_modint<m>& a) {long long x; is >> x; a = x; return is;}
template<typename T> istream& operator>>(istream& is, vector<T>& v){int n = v.size(); assert(n > 0); rep(i, n) is >> v[i]; return is;}
template<typename U, typename T> ostream& operator<<(ostream& os, const pair<U, T>& p){os << p.first << ' ' << p.second; return os;}
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v){int n = v.size(); rep(i, n) os << v[i] << (i == n - 1 ? "\n" : " "); return os;}
template<typename T> ostream& operator<<(ostream& os, const vector<vector<T>>& v){int n = v.size(); rep(i, n) os << v[i] << (i == n - 1 ? "\n" : ""); return os;}
template<typename T> ostream& operator<<(ostream& os, const set<T>& se){for(T x : se) os << x << " "; os << "\n"; return os;}
template<typename T> ostream& operator<<(ostream& os, const unordered_set<T>& se){for(T x : se) os << x << " "; os << "\n"; return os;}
template<typename S, auto op, auto e> ostream& operator<<(ostream& os, const atcoder::segtree<S, op, e>& seg){int n = seg.max_right(0, [](S){return true;}); rep(i, n) os << seg.get(i) << (i == n - 1 ? "\n" : " "); return os;}
template<typename S, auto op, auto e, typename F, auto mapping, auto composition, auto id> ostream& operator<<(ostream& os, const atcoder::lazy_segtree<S, op, e, F, mapping, composition, id>& seg){int n = seg.max_right(0, [](S){return true;}); rep(i, n) os << seg.get(i) << (i == n - 1 ? "\n" : " "); return os;}

template<typename T> void chmin(T& a, T b){a = min(a, b);}
template<typename T> void chmax(T& a, T b){a = max(a, b);}

template<typename T>
T pow_mod(T A, T N, T MOD){
	T res = 1 % MOD;
	A %= MOD;
	while(N){
		if(N & 1) res = (res * A) % MOD;
		A = (A * A) % MOD;
		N >>= 1;
	}
	return res;
}

template<typename T>
T pow_real(T A, T N, T INF){
	T res = 1;
	while(N){
		if(N & 1){
			res = (res * A);
			if(res > INF) res = INF;
		}
		A = (A * A);
		if(A > INF) A = INF;
		N >>= 1;
	}
	return res;
}

// phib -> b - 1

int main(){
	int n, m, l;
	cin >> n >> m >> l;
	int b = -1;
	{
		// ok >= b, ng < b
		int ok = 1000000001, ng = 0;
		while(ok - ng > 1){
			int mid = (ok + ng) / 2;
			cout << "? " << mid << ' ' << 1 << "\n";
			flush(cout);
			int res;
			cin >> res;
			if(res < mid) ok = mid;
			else ng = mid;
		}
		b = ok;
	}
	
	if(b == 1){
		cout << "! 0\n";
		return 0;
	}
	
	n %= b;
	if(n == 0){
		if(m == 0 and l > 0) cout << "! 1\n";
		else cout << "! 0\n";
		return 0;
	}
	
	int e_real = pow_real<long long>(m, l, 1001001001);
	int e = pow_mod<long long>(m, l, b - 1);
	int ans;
	
	if(e_real >= (b - 1)) ans = pow_mod<long long>(n, e + (b - 1), b);
	else ans = pow_mod<long long>(n, e, b);
	cout << "! " << ans << "\n";
	
	return 0;
}