//Multiplication of two matrices given in ftA.dat and ftB.dat to ftC.dat without using array.
//
// Assumption made is that the size of the matrices are known.
import java.io.*;

public class soln10thu
{
	public static void main(String args[]) 
	{
		int p, m, n; //Size of matrices are p*n and n*m;
		p=2;
		n=3;
		m=4;
		
		try
		{
			File fa = new File("fileA.dat");
			File fb = new File("fileB.dat");
			File fc = new File("fileC.dat");
			File ft = new File("Temp.dat");
			
			FileOutputStream out = new FileOutputStream(ft);
			PrintWriter pw = new PrintWriter(out);
			
			for(int i=0; i<m; i++)
			{
				FileInputStream in1 = new FileInputStream(fb);
				DataInputStream ds1 = new DataInputStream(in1);
				
				//Skip i elements
				for(int k=0; k<i; k++)
					ds1.readLine();

				for(int j=0; j<n; j++)
				{
					String str = ds1.readLine();
					int x = (Integer.valueOf(str)).intValue();
					pw.println(x);

					if(j<n-1)
					//Skip m-1 elements
					for(int k=0; k<m-1; k++)
					{
						str = ds1.readLine();
					}
				}

				ds1.close();
				in1.close();
			}

			pw.close();
			out.close();

			FileOutputStream outc = new FileOutputStream(fc);
			PrintWriter pwc = new PrintWriter(outc);
			
			for(int i=0; i<p; i++)
			{
				FileInputStream in3 = new FileInputStream(ft);
				DataInputStream ds3 = new DataInputStream(in3);
				for(int j=0; j<m; j++)
				{
					FileInputStream in1 = new FileInputStream(fa);
					DataInputStream ds1 = new DataInputStream(in1);
					int sum = 0;

					//skip i*n data from fileA.dat
					for(int k=0; k<i*n; k++)
					{
						String str = ds1.readLine();
					}

					for(int k=0; k<n; k++)
					{
						String str;
					       	str = ds1.readLine();
						int x = (Integer.valueOf(str)).intValue();
					       	str = ds3.readLine();
						int y = (Integer.valueOf(str)).intValue();
						sum += x*y;
					}
					pwc.println(sum);

					ds1.close();
					in1.close();
				}
				ds3.close();
				in3.close();
			}
			
			pwc.close();
			outc.close();

		} catch(IOException e)
		{
			System.out.println(e);
		}
	}
}