#include <iostream>
#include <vector>

using namespace std;
vector<int>p(vector<int>&A,int &b)
{
        vector<int>C;
        int t=0;
        for(int i=0;i<A.size()||t;i++)
        {
                if(i<A.size())t+=A[i]*b;
                C.push_back(t%10);
                t/=10;
        }
        for(int i=C.size()-1;i>=0;i--)
 if(C.back()!=0)break;
 else if(!C.back())C.pop_back();
 if(C.size()==0)C.push_back(0);//去前导零
        return C;

}
int main() {
    string a;
    int b;
    cin>>a>>b;
    vector<int>A;
    for(int i=a.size()-1;i>=0;i--) A.push_back(a[i]-'0');
    auto C=p(A,b);
    for(int i=C.size()-1;i>=0;i--) {
        cout<<C[i];
    }

    return 0;
}