a = list(map(int, input().split()))
key = int(input())
l=0
r=(len(a)-1)//2
cnt=0
while(l<=r) :
    m=(l+r)>>1
    cnt+=1
    if a[m]==key:
        break
    elif a[m]>key : r=m-1
    else:
        l=m+1
    
if a[m]==key:print("YES");print(cnt)
else:
    if a[-l]==key:
        print("YES");print(cnt+1)
    else : print("NO")