rg = { '2': 5, '3': 4, '5': 0 }
tant que rg[2] > 0 et rg[3] > 0
        rg[5] += 1
        rg[3] -= 1
        rg[2] -= 1
tant que rg[2] > 0 
        rg[2] -= 1
tant que rg[3] > 0 
        rg[3] -= 1
affiche rg[5]