`\color{#1AD5F7}{⋆⟡}\color{#1AD5F7}{C}\color{#4DA6E6}{h}\color{#668EDD}{i}\color{#8077D5}{p}\color{#995FCD}{p}\color{#EA2F90}{⟡⋆}`

a = list(map(int, input().split()))
x = int(input())
if x in a:
    print(a.index(x) + 1)