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