from math import gcd
A,B,K = map(int,input().split())
g = (A*B)//gcd(A,B)
a,b = g//A,g//B
k = K//(a+b+1)
# print(g,a,b,k)
# print((a+b)*k,K+1)
la,lb = [],[]
now_a,now_b = g*k,g*k
i = (a+b)*k
while i <= K+g:
    la.append(now_a)
    lb.append(now_b)
    i += 1
    now_a += A
    now_b += B
ans_list = list(set(la+lb))
ans_list.sort()
# print(ans_list)
ans = ans_list[K-(a+b)*k]
print(ans)