for (int i = (int)stat.items_float.size(); i > 1; i--) {
                tag::statistics::statistics_item_float pair1 = stat.items_float[i];
                tag::statistics::statistics_item_float pair2 = stat.items_float[i-1];
                if (pair1.value != 0) {
                    if (pair1.time > begin_day && pair2.time <= begin_day) {
                        res_day = res_month + pair1.value * (pair1.time - begin_day);
                    } else if (pair1.time > begin_week && pair2.time <= begin_week) {
                        res_week = res_month + pair1.value * (pair1.time - begin_week);
                    } else if (pair2.time > begin_month && pair2.time <= begin_month) {
                        res_month += pair1.value * (pair1.time - begin_month);
                        break;
                    }
                    res_month += pair1.value * (pair1.time - pair2.time);
                } else {
                    if (pair1.time > begin_day && pair2.time <= begin_day) {
                        res_day = res_month;
                    } else if (pair1.time > begin_week && pair2.time <= begin_week) {
                        res_week = res_month;
                    } else if (pair2.time > begin_month && pair2.time <= begin_month) {
                        break;
                    }
                }
            }
            if (begin_day == begin_week && begin_day == begin_week) {
                res_month = res_week = res_day;
            } else if (begin_day == begin_week) {
                res_week = res_day;
            } else if (begin_week == begin_month) {
                res_month = res_week;
            }