This is something I hadn’t considered as a way to have the additive effect of multiplication:` `

```
int Multiply( int X, int Y ){
if ( X == 0 || Y == 0 )
return 0;
if ( X == 1 )
return Y;
if ( Y == 1 )
return X;
return Y + Multiply( X - 1, Y );
}
```

via here

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