def check(a, b, c):
    ng, ok = 0, c
    while ok - ng > 1:
        mid = (ng + ok) // 2
        total = mid // a * b + mid - mid // a
        if total >= c:
            ok = mid
        else:
            ng = mid

    return ok
    
a, b, c = map(int, input().split())

print(check(a, b, c))