#include <cstdio>
#include <cstring>

using namespace std;

class HN
{
private:
	char x[1000005];
public:
	HN()
	{
		memset(x, 0, sizeof(x));
		x[0]=1;
	}
	HN(int n)
	{
		memset(x, 0, sizeof(x));
		x[0]=0;
		do
		{
			x[++x[0]]++;
			n/=10;
		}
		while(n);
	}
	HN operator /(long long k)
	{
		long long r=0;
		for(int i=x[0];i>0;i--)
		{
			r=r*10+x[i];
			x[i]=r/k;
			r%=k;
		}
		while(x[0]>1 && !x[x[0]])
			--x[0];
		if(r!=0)
		{
			int carry=1;
			for(int i=1;carry==1 && i<=x[0];i++)
			{
				x[i]+=carry;
				carry=x[i]/10;
				x[i]%=10;
			}
			if(carry==1)x[++x[0]]=1;
		}
		return *this;
	}
	HN operator *(long long k)
	{
		long long r=0;
		for(int i=1;i<=x[0];i++)
		{
			x[i]=(x[i]*k+r)%10;
			r=(x[i]*k+r)/10;
		}
		while(r)
		{
			x[++x[0]]=r%10;
			r/=10;
		}
		return *this;
	}
	void scan(void)
	{
		char c;
		x[0]=0;
		scanf("%c", &c);
		while(c!='\n')
		{
			c-='0';
			x[++x[0]]=c;
			scanf("%c", &c);
		}
		for(int i=1;i<=x[0]/2;i++)
		{
			int aux=x[i];
			x[i]=x[x[0]-i+1];
			x[x[0]-i+1]=aux;
		}
	}
	void print()
	{
		for(int i=x[0];i>0;i--)
			printf("%d", x[i]);
		printf("\n");
	}
};

int main()
{
    freopen("next.in", "r", stdin);
    freopen("next.out", "w", stdout);
    HN n;
    long long d;
    n.scan();
    scanf("%I64d", &d);
    n=n/d;
    n=n*d;
    n.print();
    return 0;
}