let input:[Int] = readLine()!.split(separator: " ").map{Int($0)!}
var money:Int = 0
var age:Int = 1
while true {
    if age % input[0] != 0 {
        money += 1
    }
    else {
        money += input[1]
    }
    if money >= input[2] {
        break
    }
    age += 1
}
print(age)