import sys
N,A,B=input().split(),input().split(),input().split()
x = int(N[1])
n = int(N[0])
z=0
A = [int(a) for a in A]
B = [int(b) for b in B]
for i in range(0,n):
if A[i] > B[i]:
z += B[i]
else:
z += A[i]
if z > x:
print(x)
else:
print(z)

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