Maximum of a matrix

The below method returns the maximum of a matrix of integers:

    public int MatrixMaxValue(int[][] x, int n, int m) {

        int i = 0;
        int j = 0;
        int maxim = x[0][0];
        for (i = 0; i < n; i++) {
            for (j = 0; j < m; j++) {
                if (maxim < x[i][j]) {
                    maxim = x[i][j];
                }
            }
        }
        return maxim;
    }