How Do I Solve The Following Integer Programming Problem By Using Branch And Bou

How do i solve the following integer programming problem by using branch and bound?
minimize x1+x2+x3+x4+x5+x6
subject to:
x1+x2>=7
x2+x3>=6
x3+x4>=6
x4+x5>=5
x5+x6>=4
x6+x1>=4
x1, x2, x3, x4, x5, x6 >=0
 
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