#include <stdio.h>

int hoge=60;

int askask(int x) {
	int ch=hoge--;
	if(hoge<0) hoge=0;
	printf("ask %d\n",x);
	if(x>ch) return -1;
	if(x<ch) return 1;
	return 0;
	
}

int main(void) {
    int i, ask = (1 << 29), ans0, ans1 = -1;
    for(i = 0; i < 30; i++) {
		ans0=askask(1);
        if(ans0 != 1) {
            ask = 2 * i + (ans0 == 0);
            break;
        }
        
        int t = ask - (2 * i + 1); //t = (t < 0 ? 0 : t);
		ans1=askask(t);
        int j = 28 - i; j = (j < 0 ? 0 : j);
        ask += ans1 * (1 << j);
        if(ans1 == 0) {	break; }
    }
    printf("! %d\n", ask); fflush(stdout);
    return 0;
}