static int rangeDivisor ( int m , int n , int a , int b ) {
  int lcm = FindLCM ( a , b ) ;
  int a_divisor = n / a - ( m - 1 ) / a ;
  int b_divisor = n / b - ( m - 1 ) / b ;
  int common_divisor = n / lcm - ( m - 1 ) / lcm ;
  int ans = a_divisor + b_divisor - common_divisor ;
  return ans ;
}

static int rangeDivisor ( int m , int n , int a , int b ) { int lcm = FindLCM ( a , b ) ; int a_divisor = n / a - ( m - 1 ) / a ; int b_divisor = n / b - ( m - 1 ) / b ; int common_divisor = n / lcm - ( m - 1 ) / lcm ; int ans = a_divisor + b_divisor - common_divisor ; return ans ; }
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