def main():
    import sys
    input = sys.stdin.read().split()
    n = int(input[0])
    a = list(map(int, input[1:n+1]))
    
    valid = 0
    for i in range(n):
        for j in range(i+1, n):
            # Check all triplets affected by i and j
            # Create a copy to test the swap
            a_swapped = a.copy()
            a_swapped[i], a_swapped[j] = a_swapped[j], a_swapped[i]
            # Check all triplets
            is_valid = True
            for k in range(n-2):
                x, y, z = a_swapped[k], a_swapped[k+1], a_swapped[k+2]
                if y != max(x, y, z) and y != min(x, y, z):
                    is_valid = False
                    break
            if is_valid:
                valid += 1
    print(valid)

if __name__ == "__main__":
    main()