#include "stdio.h"#include "malloc.h"#include "math.h"void calc(int num,int N,long *data);int main(){    int N,num;    long *result;    scanf("%d",&num);    scanf("%d",&N);    result=(long *)malloc(N*sizeof(long));    calc(num,N,result);    return 0;}void calc(int num,int N,long *data){    long i=0;    long val=0;    long dif;    int j;    if(num<=0||N<=0)    {        printf("0");        return;    }    for(i=0;i<N||val>0;i++)    {        val=val+num*(N-i);        dif=val%10;        data[i]=dif;        val=(val-dif)/10;    }    for(j=i-1;j>=0;j--)    {        printf("%ld",data[j]);    }}