#include <iostream>
#include <vector>
using namespace std;
string multiply_big_integer(string A, string B) {
    int sz_a = (int) A.size();
    int sz_b = (int) B.size();
    vector<int> v(sz_a + sz_b, 0);
    for(int i = sz_a - 1; i >= 0; i--) {
        for(int j = sz_b - 1; j >= 0; j--) {
            v[i + j + 1] += (A[i] - '0') * (B[j] - '0');
        }
    }
    for(int i = sz_a + sz_b - 1; i >= 0; i--) {
        if(v[i] > 9) {
            v[i - 1] += (v[i] / 10);
            v[i] %= 10;
        }
    }
    int i = 0;
    while(v[i] == 0) {
        i++;
    }
    string product = "";
    for(int j = i; j < sz_a + sz_b; j++) {
        product += (v[j] + '0');
    }
    return product;
}
int main()
{
    string a, b;
    cin >> a >> b;
    cout << multiply_big_integer(a, b) << endl;
    return 0;
}