r=1000000000
l=1
mid=int((l+r)/2)
print(mid, flush=True)
c=input()
while c!='=' :
    if c=='<' :
        r=mid-1
    elif c=='>' :
        l=mid+1
    mid=int((l+r)/2)
    print(mid, flush=True)
    c=input()

print (f'! {mid}', flush=True)