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A - Growth Record

Score : $100$ points

Problem Statement

Takahashi had his $N$-th birthday, when he was $T$ centimeters tall.
Additionally, we know the following facts:

• In each year between Takahashi's birth ($0$-th birthday) and his $X$-th birthday, his height increased by $D$ centimeters. More formally, for each $i = 1, 2, \ldots, X$, his height increased by $D$ centimeters between his $(i-1)$-th birthday and his $i$-th birthday.
• Between Takahashi's $X$-th birthday and his $N$-th birthday, his height did not change.

Find Takahashi's height on his $M$-th birthday, in centimeters.

Constraints

• $0 \leq M \lt N \leq 100$
• $1 \leq X \leq N$
• $1 \leq T \leq 200$
• $1 \leq D \leq 100$
• Takahashi was at least $1$ centimeter tall at his birth.
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$N$ $M$ $X$ $T$ $D$

Output

Print the answer as an integer.

38 20 17 168 3

168

In this sample, Takahashi was $168$ centimeters tall on his $38$-th birthday. Also, his height did not change between his $17$-th birthday and $38$-th birthday.
From these facts, we find that he was $168$ centimeters tall on his $20$-th birthday, so the answer is $168$.

1 0 1 3 2

1

In this sample, Takahashi was $1$ centimeter tall on his $0(=M)$-th birthday and $3(=T)$ centimeters tall on his $1(=N)$-st birthday.

100 10 100 180 1

90