((NPWT2515) + (NPWT2517) + (NPWT2519) + (NPWT2765) + (NPWT2766) + (NPWT2767) + (NPWT2768) + (NPWT2769) + (NPWT3004) + (NPWT3011) + (NPWT3016) + (NPWT3018) + (NPWT3019) + (NPWT3260) + (NPWT3265) + (NPWT3266) + (NPWT3267) + (NPWT3268) + (NPWT3269) + (NPWT3504) + (NPWT3518) + (NPWT3519)) * ((NPWT5008 + NPWT5009)/2);