CodeForces 379 A.New Year Candles（水~）

#include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<ctime>
using namespace std;
typedef long long ll;
typedef pair<int,int>P;
const int INF=0x3f3f3f3f,maxn=100001;
int main()
{
int a,b;
while(~scanf("%d%d",&a,&b))
{
int ans=a,num=a;
while(num>=b)
{
ans+=num/b;
num=num/b+num%b;
}
printf("%d\n",ans);
}
return 0;
}