t = {}
n = io.read("*n", "*l")
for i = 1, n do
    s = io.read()
    if(t[s] == nil) then t[s] = 1 else t[s] = t[s] + 1 end
end
max = 1
for k, v in pairs(t) do
    max = math.max(max, v)
end
if(max <= math.floor((n + 1) / 2)) then print("YES") else print("NO") end