90分是为什么啊大佬们

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main()
{
    int smoke = 0, chang = 0, m=0, stub=0;
    scanf("%d %d", &smoke, &chang);
    m = smoke / chang;
    stub = smoke + m;
    if (m>=chang)
    {
        m = stub / chang;
        stub = smoke + m;
    }
    printf("%d", stub);
    return 0;
}