n = io.read("*n")
a = {}
for i = 1, n do a[i] = io.read("*n") end
b = {}
for i = 1, n do b[i] = io.read("*n") end
c = 0
for i = 1, n do if a[i] <= b[i] then c = c + 1 end end
print(c)