#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("next.in");
ofstream fout("next.out");
typedef long long var;
int v[1000002];
var lv1;
var D;
var div()
{
      var i,t=0;
      for (i=lv1;i>0;i--,t%=D)
               t=t*10+v[i];
      return t;
}
void add()
{
      vari,t=0;
      for (i=1;i<=lv1 || t || D;i++,t/=10,D/=10)
              v[i]=(t+=v[i]+D%10)%10;
      lv1=i-1;
}

int main()
{
    vari=1,aux;
    char x;
    while(fin.get(x) && x!='\n')
    {   v[i]=x-48;
            i++;
    }
    fin>>D;
    lv1=i-1;
       for(i=1;i<=lv1/2;i++)
        {   aux=v[i];
            v[i]=v[lv1-i+1];
            v[lv1-i+1]=aux;
        }
    D=(D-div())%D;
    add();
    for(i=lv1;i>=1;i--)
        fout<<v[i];
    return 0;
}