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G = int(input())
P = int(input())
closed = False
count= 0
docks = set()
for i in range(P):
g = int(input())
if not closed:
can_land = False
for d in range(g,0,-1):
if d not in docks:
docks.add(d)
can_land = True
break
if not can_land:
closed = True
else:
count += 1
print(count)
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