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