N=int(input())
a=[int(i) for i in input().split() ]

#自身より前に自身より大きい
exist_bigger_before=[True for i in range(N+1)]
tmp_max=0
for i in range(N):
    if a[i]>tmp_max:
        tmp_max=a[i]
        exist_bigger_before[a[i]] = False

for i in reversed(range(N+1)):
    if(exist_bigger_before[i]==True):
        print(i)
        break