第十个点有错？？？！

#include<cmath>
#include<cstdio>
#include<cstring>
#include<algorithm> 
using namespace std;
#define ll long long
const int maxn=2000+10;
ll ans[maxn];
int k,n;
long long pw(int a,int b){
    int bns=1;
    for(int i=1;i<=b;i++)bns*=a;
    return bns;
}
int main(){
    scanf("%d%d",&k,&n);
    int j=1,i=0;
    while(j<=n){
        ans[j]=pw(k,i);
        for(int k=1;k<j;k++)ans[k+j]=ans[k]+ans[j];
        j*=2;
        i++;
    }
    printf("%lld",ans[n]);
    return 0;
}
//麻烦大佬看一下