#include <iostream>
#include <complex>
using namespace std;
double p(double x, int y = 0) {
 return 2 * x + 3 * y;
}
int q(int &y) {
    std::cout<<"!";
 y--; return y * 2;
}
double p(int x) {
 return 3 * x;
}
int r(int &z) {
    std::cout<<"!";
 ++z; return z - 1;
}
void s(int &x, int y, int z(int &x)) {
 x += z(y);
 cout << complex<double>(x++, y) << endl;
}
int main() {
 int (*t[3])(int &x) = {q, r, q};
// int y(3), z(4);
// cout << p(2) << "," << p(2.) << "," << p(2, 2) << endl;
// for(int x = 0; x < y; x++) s(z, x, t[x]);
// cout << z << endl;
std::cout<<t[1]<<q<<r;
 return 0;
}
//6,4,10
//------------ z =1;z=4
//1.(1,0)
//2.(4,1)
//3.