package main
import "fmt"

func f(a, b, c int64) (int64) {
	if a<=c {
		if d:=a-1+b; c%d<a {
			return c/d*a + c%d
		} else {
			return c/d*a + a
		}
	}
	return c
}

func main() {
	var a,b,c int64
	fmt.Scan(&a,&b,&c)
	fmt.Println(f(a,b,c))
}