#include <iostream>
#include <vector>
using namespace std;

vector<int> c(vector<int>& v1, int c)
{
    vector<int> v;
    int x = 0;
    for (int i = 0; i < v1.size() || x; ++i)
    {
        if (i < v1.size()) x += c * v1[i];
        v.emplace_back(x % 10);
        x = x / 10;
    }
    while (v.size() > 1 && v.back() == 0)   v.pop_back();
    return v;
}

int main(void)
{
    string a;
    int b;
    vector<int> v, v1;
    cin >> a >> b;
    for (int i = a.size() - 1; i > -1; --i)   v1.emplace_back(a[i] - '0');
    v = c(v1, b);
    for (int i = v.size() - 1; i > -1; --i)   printf("%d", v[i]);
    return 0;
}