已AC代碼:
#include<cstdio>
using namespace std;
int main()
{
int n, k;
while((scanf("%d%d", &n, &k)) != EOF)
{
if(n<=k)
{
printf("2\n");
}
else
{
if(n*2%k == 0)
printf("%d\n", n*2/k);
else
printf("%d\n", n*2/k+1);
}
}
}