def resumeix_quantitats(consum, canvi):
    r = {}
    nc = []
    for linia in consum:
        prod, quant, unitat = linia
        if unitat in canvi:
            qu = quant*canvi[unitat]
            if prod in r:
                r[prod] += qu
            else:
                r[prod] = qu
        else:
            nc.append(linia)
    return r, nc