function read()
    return io.read("*num")
end
n = read()
T = read()
A = read()
Max = math.maxinteger;
for i = 1, n do
    x = read()
    now = math.abs(T - x * 0.06 - A)
    if now < Max then
        Max = now
        ans = i
    end
end
print(ans)

