#!/usr/bin/env python3

import sys

def UFM(A):
    if len(A) == 0:
        return None

    m = 0
    M = len(A)

    while M - 1 != m:
        if M - 2 == m:
            if A[m] > A[m + 1]:
                return A[m]
            else:
                return A[m + 1]

        lh = (M - m) // 2

        if A[lh - 1] < A[lh] and A[lh] > A[lh + 1]:
            return A[lh]
        elif A[lh - 1] < A[lh]:
            m = lh
        else:
            M = lh

    return A[m]

A = []
for line in sys.stdin:
    line = line.strip()
    if line == '' or line == '\n':
        break
    A.append(int(line))

print(UFM(A))