while True:
try:
#使用map函数简化for循环
n, x = map(int, input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
total = 0
for i in range(n):
total += min(a[i], b[i])
print(min(total, x))
except Exception as e:
break

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