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\begin{aligned} &\frac{c_{h}}{\alpha}\left\{p \int_{t_{i-1}}^{t_{i}^{p}} d u-\int_{t_{i-1}}^{t_{i}^{p}} D(u) d u-p \int_{t_{i-1}}^{t_{i}^{p}} e^{\alpha\left(u-t_{i}^{p}\right)} d u+\int_{t_{i-1}}^{t_{i}^{p}} e^{\alpha\left(u-t_{i}^{p}\right)} D(u) d u\right\} \\ &\quad+\frac{c_{h}}{\alpha}\left\{\int_{t_{i}^{p}}^{t_{i}} e^{\alpha\left(u-t_{i}^{p}\right)} D(u) d u-\int_{t_{i}^{p}}^{t_{i}} D(u) d u\right\} \\ &\quad+c_{1} \int_{t_{i-1}}^{t_{i}^{p}} p d u-c_{1} \int_{t_{i-1}}^{t_{i}} D(u) d u \end{aligned}