Diplom

def check(g, w, h, n):
    hor = g // w
    ver = g // h
    total = hor * ver
    return total >= n

w, h, n = map(int,input().split())

l = 0
r = max(w, h) * n

while r - l > 1:
    g = l + (r - l) // 2
    if check(g, w, h, n):
        r = g
    else:
        l = g
print(r)