public class Matrix {
  private int rows = 0;
  private int columns = 0;
  private int[][] matrix;

  Matrix(int rows, int columns) {
    this.rows = rows;
    this.columns = columns;
    this.init();
  }

  private void init() {
    this.matrix = new int[this.rows][this.columns];

    for(int r = 0; r < this.rows; r++) {
      for(int c = 0; c < this.columns; c++) {
        this.setValue(r+1, c+1, 0);
      }
    }
  }

  int getValue(int row, int column) {
    return this.matrix[row-1][column-1];
  }

  int getNumberOfColumns() {
    return this.columns;
  }

  int getNumberOfRows() {
    return this.rows;
  }

  void setValue(int row, int column, int value) {
    this.matrix[row-1][column-1] = value;
  }

  void multiply(int scalar) {
    for(int r = 0; r < this.rows; r++) {
      for(int c = 0; c < this.columns; c++) {
        this.matrix[r][c] *= scalar;
      }
    }
  }

  void multiply(Matrix matrix) {
    if(isSameSize(matrix)) {
      for(int r = 0; r < this.rows; r++) {
        for(int c = 0; c < this.columns; c++) {
          this.matrix[r][c] *= matrix.getValue(r+1, c+1);
        }
      }
    } else {
      throw new MatrixException();
    }
  }

  boolean isSameSize(Matrix matrix) {
    return this.getNumberOfColumns() == matrix.getNumberOfColumns() && this.getNumberOfRows() == matrix.getNumberOfRows();
  }

  void add(Matrix matrix) {
    if(this.getNumberOfColumns() == matrix.getNumberOfColumns() && this.getNumberOfRows() == matrix.getNumberOfRows()) {
      for(int r = 0; r < this.rows; r++) {
        for(int c = 0; c < this.columns; c++) {
          this.matrix[r][c] += matrix.getValue(r+1, c+1);
        }
      }
    }
  }

  void print() {
    for(int r = 0; r < this.rows; r++) {
      for(int c = 0; c < this.columns; c++) {
        System.out.printf("%5d", this.getValue(r+1, c+1));
      }
      System.out.print("\n");
    }
  }
}

class MatrixException extends RuntimeException {

}