#include <stdio.h>

int main() { int n, m,k; scanf("%d", &n); scanf("%d",&k); m = n; while (m >= k) { n = n + m / k; m = m % k + m / k; } printf("%d", n); return 0; }

#include <bits/stdc++.h>
using namespace std;
int main()
{
    long long n,k;
    cin>>n>>k;
    int di=n;
    int ans=n;
    while(n>=k)
    {
        di=n%k;
        n/=k;
        ans+=n;
        n+=di;
    }
    cout<<ans;
    return 0;
}

进行过程模拟

n,m=map(int,input().split())
count=n
while n>=m:
    temp=n%m
    n//=m
    count+=n
    n+=temp
print(count)