def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    
    N = int(data[0])
    A = list(map(int, data[1:N+1]))
    
    count = 0
    
    for i in range(N):
        for j in range(i+1, N):
            if i == j:
                continue
            ai = A[i]
            aj = A[j]
            A[i], A[j] = aj, ai
            valid = True
            for k in [i-2, i-1, i, i+1, i+2, j-2, j-1, j, j+1, j+2]:
                if k < 0 or k >= N-2:
                    continue
                a, b, c = A[k], A[k+1], A[k+2]
                if b != max(a, b, c) and b != min(a, b, c):
                    valid = False
                    break
            if valid:
                count += 1
            A[i], A[j] = ai, aj
    
    print(count)

if __name__ == "__main__":
    main()