No way to run my code, idk how to force a float as an Int

[pabloclsn]

hi guys I have this few line,
    
    
     nombreDePyramides = 4
    var maxLignes: int = ((nombreDePyramides+2)*(nombreDePyramides+3)/2-4)
    

here the second line is giving me a float but I need a int because of the rest 
of the code and I can't find the syntax ...
    
    
    -Pro-de-Pablo:sastentua pablocolson$ nim c satstentua.nim
    Hint: used config file '/Users/pablocolson/nim/config/nim.cfg' [Conf]
    Hint: system [Processing]
    Hint: satstentua [Processing]
    satstentua.nim(2, 68) Error: type mismatch: got (float) but expected 'int'
    MacBook-Pro-de-Pablo:sastentua pablocolson$
    

thanks for awnsers