#include<iostream>
using namespace std;
int N,M;
void jinzhi(int x,int m){
if(x==0) return;
jinzhi(x/m,m);
switch(x%m){
case 10:cout<<'A';break;
case 11:cout<<'B';break;
case 12:cout<<'C';break;
case 13:cout<<'D';break;
case 14:cout<<'E';break;
case 15:cout<<'F';break;
default: cout<<x%m;
}
}
int main() {
cin>>N>>M;
jinzhi(N,M);
return 0;
}