#include <bits/stdc++.h>

//#define getchar getchar_unlocked

using namespace std;

typedef complex<double> base;

void fft (vector<base> & a, bool invert) {
    int n = (int) a.size();
    if (n == 1)  return;

    vector<base> a0 (n/2),  a1 (n/2);
    for (int i=0, j=0; i<n; i+=2, ++j) {
        a0[j] = a[i];
        a1[j] = a[i+1];
    }
    fft (a0, invert);
    fft (a1, invert);

    double ang = 2*acos(-1)/n * (invert ? -1 : 1);
    base w (1),  wn (cos(ang), sin(ang));
    for (int i=0; i<n/2; ++i) {
        a[i] = a0[i] + w * a1[i];
        a[i+n/2] = a0[i] - w * a1[i];
        if (invert)
            a[i] /= 2,  a[i+n/2] /= 2;
        w *= wn;
    }
}

void multiply (const vector<int> & a, const vector<int> & b, vector<int> & res) {
    vector<base> fa (a.begin(), a.end());
    vector<base> fb (b.begin(), b.end());
    size_t n = 1;
    while (n < max (a.size(), b.size()))  n <<= 1;
    n <<= 1;
    fa.resize (n),  fb.resize (n);

    fft (fa, false),  fft (fb, false);
    for (size_t i=0; i<n; ++i)
        fa[i] *= fb[i];
    fft (fa, true);

    res.resize (n);
    for (size_t i=0; i<n; ++i)
        res[i] = int (fa[i].real() + 0.5);
    int carry = 0;
    for (size_t i=0; i<n; ++i) {
        res[i] += carry;
        carry = res[i] / 10;
        res[i] %= 10;
    }
}

vector<int> readNumber() {
    deque<int> digits;
    int c = getchar();
    while (c != '-' && !('0' <= c && c <= '9')) {
        c = getchar();
    }

    if (c == '-')
        c = getchar();

    while ('0' <= c && c <= '9')
        digits.push_front(c - '0'), c = getchar();
    return vector<int>(digits.begin(), digits.end());
}

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    vector<int> a = readNumber();
    vector<int> b = readNumber();
    vector<int> res;
    multiply(a, b, res);

    bool ok = false;
    for (int i = res.size() - 1; i >= 0; i--) {
        if (!ok && res[i] == 0) {
            continue;
        } else {
            ok = true;
        }
        cout << res[i];
    }
    if (!ok) {
        cout << 0;
    }
}