#include<iostream>
#include<math.h>

using namespace std;

int nr_digits(long int nr)
{
	int count=0;
	while(nr!=0)
	{
		count++;
		nr=nr/10;
	}
	return count;
}

int min(int x, int y)
{
	if(x>y)
	{
		return y;
	}
	else
	{
		return x;
	}
}

long int multiply(long int x, long int y)
{
	if(x>9 && y>9)
	{
		int len_x = nr_digits(x);
		int len_y = nr_digits(y);

		int len = min(x,y);
		int m = len/2;

		long int xs = x/(long int)pow(10,m);
		long int xd = x%(long int)pow(10,m);

		long int ys = y/(long int)pow(10,m);
		long int yd = y%(long int)pow(10,m);

		long int p1 = multiply(xs,ys);
		long int p2 = multiply(xd,yd);
		long int p3 = multiply(xs,yd);
		long int p4 = multiply(xd,ys);

		return (p1 * (long int)pow(10,2*m) + p2 +(p3 + p4) * pow(10,m));
	}
	else
	{
		return x*y;
	}
}

int main(void)
{
	cout<<multiply(12,22) <<"\n";

	return 0;
}