def gcd(a, b):
	while b:
		a, b = b, a % b
	return a
def lcm(a, b):
	return a * b // gcd (a, b)
li  = list(map(int,input().split(" ")))
s  = lcm(li[0],li[1])
for i in range(len(li)-2):
    s = lcm (s,li[i+2])
def f(m):
    r = 0
    for i  in li:
        r += m%i
    return r
print(f(s-1))