from math import gcd, lcm

A, B, T = map(int, input().split())
l = lcm(A, B)
g = gcd(A, B)
if l <= T:
    print(T + T % g)
else:
    ans = l
    for i in range(l // A + 1):
        for j in range(l // B + 1):
            c = A * i + B * j
            if T <= c:
                ans = min(ans, c)
    print(ans)