num=[2021 for i in range(10)]
for i in range(202010):
s=str(i)
t=1
for j in s:
num[int(j)]-=1
if num[int(j)]<0:
t=0
break
if t==0:
print(i-1)
break
num=[2021 for i in range(10)]
for i in range(202010):
s=str(i)
t=1
for j in s:
num[int(j)]-=1
if num[int(j)]<0:
t=0
break
if t==0:
print(i-1)
break
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