Problems
Value of expression 1
Value of expression 1
Compute the value of the expression for the given real numbers x and y.
2x^2 - 4xy + 3y^2 + {x + y \over 7}
Input data
Two real numbers x and y.
Output data
Print the value of the given expression with precision to the thousandths.
Examples
Input example #1
1.000 -2.000
Output example #1
21.857