n=int(input())
L=list(map(int,input().split()))
L.sort()
if L[0] !=1:
print(1)
else:
k = L[0]
for i in range(1,len(L)):
if L[i] > k+1:
print(k+1)
break
else:
k += L[i]
else:
print(k+1)