# Arithmetics

## additions

```C#
int friends = 5;
friends = friends + 1;
friends++;
```

## substrack

```C#
friends = friends - 1;
friends -=  1;
```

## multiplications

```C#
friends = friends * 2;
friends *= 2;
```

## division

```C#
friends = friends / 2;
friends /= 2;
```

## modulus

```C#
friends = friends % 3;
```