Objective function in C Program

/* Objective function */
max_: 3*(x_11 + x_21 + x_31 + x_41 + x_51) + 2*(x_12 + x_22 + x_32 +x_42 + x_52) + 4*( x_13 + x_23 + x_33 + x_34 + x_35);

/* Variable bounds */
/* Notas */
3*( x_11 + x_21 + x_31 + x_41 + x_51 ) >= 30;
2*( x_12 + x_22 + x_32 + x_42 + x_52 ) >= 40;
3*( x_11 + x_21 + x_31 + x_41 + x_51 ) <= 100;
2*( x_12 + x_22 + x_32 + x_42 + x_52 ) <= 100;
4*( x_13 + x_23 + x_33 + x_43 + x_53 ) <= 100;
/* Día 1 */
x_11 = 0;
x_12 + x_13 <= 7;
/* Día 2 */
x_21 + x_22 + x_23 <= 4;
/* Día 3 */
x_31 + x_32 + x_33 <= 10;
/* Día 4 */
x_41 + x_42 + x_43 <= 13;
/* Día 5 */
x_51 + x_52 + x_53 <= 10;


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