-1*Ea -1*Ma  + 1 >= 0
-1*Eb -1*Mb  + 1 >= 0
1*Mb  >= 0
1*Eb  >= 0
1*Sb  >= 0
1*Ma  >= 0
1*Ea  >= 0
1*Sa  >= 0
1*I  >= 0
1*I +1*Sa +1*Ea +1*Ma +1*Sb +1*Eb +1*Mb -1 >= 0