#include<iostream>
#define DM 199
#define Dm 0
using namespace std;
int main()
{
    int st,dr,sus,jos,t,i,j,m;
    st=sus=Dm;
    dr=jos=DM;
    for(i=0;i<DM;i++)
    {
        st=Dm; dr=DM;
        while(st<dr)
        {
            m=(st+dr)/2;
            cout<<i<<" "<<m<<"\n";
            cout.flush();
            cin>>t;
            if(t==0) return 0;
            if(t>0) dr=m-1;
            if(t<0) st=m+1;
        }
    }
}