a = input().split(" ")

judge = {"1":0,"4":0}

for i in range(len(a)):
    if a[i] == "?":
        a[i] = "1"
        b = a[1] - a[0]
        c = a[1] - a[2]
        if b*c > 0:
            judge["1"] = 1

        a[i] = "4"
        b = a[1] - a[0]
        c = a[1] - a[2]
        if b*c > 0:
            judge["4"] = 1

if judge["1"] == 1 and judge["4"] == 1:
    print(14)
elif judge["1"] == 1 :
    print(1)
elif judge["4"] == 1 :
    print(4)