poj2509

简单题

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
using namespace std;

int main()
{
    //freopen("D:\\t.txt", "r", stdin);
    int n, k;
    while (scanf("%d%d", &n, &k) != EOF)
    {
        int ans = n + (n / (k - 1));
        if (n % (k - 1) == 0)
            ans--;
        printf("%d\n", ans);
    }
    return 0;
}