Minimize
obj: 1200 H1 + 1200 H2 + 1200 H3 + 1200 H4 + 2500 F1 + 2500 F2 + 2500 F3 + 
2500 F4 + 1000 I1 + 1000 I2 + 1000 I3 + 1000 I4 + 5250 W1 + 5250 W2 + 5250 
W3 + 5250 W4 + 7875 O1 + 7875 O2 + 7875 O3 + 7875 O4 +
7000 S1 + 7000 S2 + 7000 S3 + 7000 S4
Subject To:
c1: W0 + H1 - F1 - W1 = 0
c2: W1 + H2 - F2 - W2 = 0
c3: W2 + H3 - F3 - W3 = 0
c4: W3 + H4 - F4 - W4 = 0
c5: W1 + O1 - U1 - P1 = 0
c6: W2 + O2 - U2 - P2 = 0
c7: W3 + O3 - U3 - P3 = 0
c8: W4 + O4 - U4 - P4 = 0
c9: I0 + P1 + S1 - I1 = 380
c10: I1 + P2 + S2 - I2 = 630
c11: I2 + P3 + S3 - I3 = 220
c12: I3 + P4 + S4 - I4 = 160
c13: I0 = 80
c14: I4 >= 20
c15: W0 = 280
c16: 7 O1 - 3 W1 <= 0
c17: 7 O2 - 3 W2 <= 0
c18: 7 O3 - 3 W3 <= 0
c19: 7 O4 - 3 W4 <= 0
Bounds
0 <= W1 <= 370
0 <= W2 <= 370
0 <= W3 <= 370
0 <= W4 <= 370
0 <= S1 <= 100
0 <= S2 <= 100
0 <= S3 <= 100
0 <= S4 <= 100
End