import math as mt
def authentication(arr, n, m):
    t=0
    while (1):
        items = 0
        for i in range(n):
            items += (t//arr[i])
        if(items>=m):
            return t+10
        t+=1
arr=list(map(int,input().split()))
n=len(arr)
m=30

print(authentication(arr, n, m))