def matrix_max_index(X):
    max = X[0][0]
    index_i = 0
    index_j = 0
    for i in range(0, len(X)):
        for j in range(0, len(X[i])):
            if(X[i][j] > max):
                max = X[i][j]
                index_i = i
                index_j = j
    
    return(index_i,index_j)