def ask(i):
    print("?",i+1,flush=True)
    return int(input())-1

n=int(input())
a=[0]*n
a[n-1]=n-1
l,r=0,n-1
for _ in range(10):
    if l+1==r:
        ask(0)
    else:
        i=(l+r)//2
        a[i]=ask(i)
        if a[i]-a[l]<i-l:r=i
        else:l=i

print("Yes",l+1,r+1)