max 100 x1 + 360 x2 + 400 x3 + 200 x4 + 640 x5
st 
x1 + x2 + 2 x3 + x4 + 2 x5 <= 3
x1 <= 1
x2 <= 1
x3 <= 1
x4 <= 1
x5 <= 1
x1 >= 0
x2 >= 0
x3 >= 0
x4 >= 0 
x5 >= 0
end
gin 5
leave