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minimize(F,{sum(X[1,j],j=1..5)=160,sum(X[2,j],j=1..5)=140,sum(X[3,j],j=1..5)=60,sum(X[i,1],i=1..3)=80,sum(X[i,2],i=1..3)=80,sum(X[i,3],i=1..3)=60,sum(X[i,4],i=1..3)=60,sum(X[i,5],i=1..3)=80},NONNEGATIVE);