Maths in C#

int x = 7;
int y = 1;
int addition = x + y;
Console.WriteLine(addition);
//adds int x and int y
int x = 9;
int y = 2;
int multiplication = x * y;
Console.WriteLine(multiplication);
//multiplies int x and int y
int x = 3;
int y = 3;
int subtraction = x - y;
Console.WriteLine(subtraction);
//subtracts int x and int y
int x = 2;
int y = 7;
int division = x / y;
Console.WriteLine(division);
//divides int x and int y