#include<iostream>
#include<vector>
using namespace std;
vector<int> mul(vector<int>&A,int B){
    vector<int>C;int t,i,f;
    t=0,i=0;
    for(i=0;i<A.size();i++){
        f=A[i]*B+t;
        C.push_back(f%10);
        t=f/10;
    }
    while(t){
        C.push_back(t%10);
        t/=10;
    }
    while(C.size()>1&&C.back()==0)C.pop_back();
    return C;
}
int main(){
    string a;
    int b;
    cin>>a>>b;
    vector<int>A,C;
    for(int i=a.size()-1;i>=0;i--){
        A.push_back(a[i]-'0');
    }
    C=mul(A,b);
    for(int i=C.size()-1;i>=0;i--)cout<<C[i];
    cout<<endl;
    return 0;
}

常规写法。