#include <iostream>
using namespace std;
int main()
{
    int n, k, a[41] = { 0 }, f[7][41] = { 0 }, sum = 1, num = 1;
    cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        char c;
        cin >> c;
        a[i] = c - '0';
        f[0][i] = f[0][i - 1] * 10 + a[i];
    }
    for (int i = 1; i <= k; i++) {
        for (int j = i + 1; j <= n; j++) {
            sum = 0, num = 1;
            for (int e = j - 1; e >= i; e--) {
                sum = sum + a[e + 1] * num;
                num *= 10;
                if (f[i][j] < f[i - 1][e] * sum) {
                    f[i][j] = f[i - 1][e] * sum;
                }
                //cout << i << " " << j << " " << f[i - 1][e] << " " << sum << " " << f[i][j] << endl;
            }
            if (i == j)
                f[i][j] = f[i - 1][j];
        }
    }
    cout << f[k][n];
}