#include <stdio.h>
#include <string.h>
#include <algorithm>
#define NrCifMax 1000099
using namespace std;
int N[NrCifMax],D[18],M[NrCifMax];
int n,d;

void Get(int A[])
{
    char V[NrCifMax];
    fgets(V+1,NrCifMax,stdin);
	A[0]=strlen(V+1)-1;
	//reverse(V+1,V+1+A[0]);
	for(int i=1;i<=A[0];i++)A[A[0]+1-i]=(V[i]-'0');

}
void Scad(int A[],int B[])
{
      int i, t = 0;
      for (i = 1; i <= A[0]; i++) {
              A[i] -= ((i <= B[0]) ? B[i] : 0) + t;
              A[i] += (t = A[i] < 0) * 10;
      }
      for (; A[0] > 1 && !A[A[0]]; A[0]--);
}

bool MaiMare(int A[], int B[])
{
    if(A[0]>B[0])return true;
    if(A[0]==B[0])
    {
        for(int i=A[0];i>0;i--)
            if(A[i]>B[i])return true;
            else if(A[i]<B[i])return false;
        return true;
    }
    return false;
}
void Adun(int A[], int B[])
{
      int i, t = 0;
      for (i=1; i<=A[0] || i<=B[0] || t; i++, t/=10)
              A[i] = (t += A[i] + B[i]) % 10;
      A[0] = i - 1;
}

int main()
{
    freopen("next.in", "r", stdin);
	freopen("next.out", "w", stdout);
	Get(N);Get(D);
    memcpy(M,N,sizeof(N));
	while(MaiMare(N,D))Scad(N,D);

	if(N[0])
	{
	    Scad(D,N);
	    Adun(M,D);
    }
    for(int i=M[0];i>0;i--)printf("%d",M[i]);printf("\n");
	return 0;

}