# -*- coding: utf-8 -*-
"""
No.604 誕生日のお小遣い
https://yukicoder.me/problems/no/604

"""
import sys
from sys import stdin
from math import ceil
input = stdin.readline


def solve(A, B, C):
    if A == 1:
        return ceil(C / B)

    cycle_income = B + (A - 1)
    cycle = C // cycle_income
    ans1 = C - (cycle_income * cycle) + A * cycle
    ans2 = (cycle + 1) * A
    return min(ans1, ans2)



def main(args):
    A, B, C = map(int, input().split())
    ans = solve(A, B, C)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])