What is the smallest number of test cases required to Provide 100% bra

What is the smallest number of test cases required to Provide 100% branch coverage?

If(x>y) x=x+1; 
 
 else y=y+1; 
 
 while(x>y) 
 
 { 
 
 y=x*y; x=x+1; 
 
 } 
 
 

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