def gcd(x,y):
    while x*y!=0:
        if x>y: x=x%y
        else: y=y%x
    return x+y

a, b, c, d = list(map(int, open('input.txt','r').read().split()))
outfile = open('output.txt','w') 
n = gcd(gcd(gcd(a, b), c), d)
kl = int(a / n + b / n + c / n + d / n)
outfile.write('%d\n' % (kl))
outfile.close()