Buy Please

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Chef went to a shop and buys $a$ pens and $b$ pencils. Each pen costs $x$ units and each pencil costs $y$ units. Now find what is the total amount Chef will spend to buy $a$ pens and $b$ pencils. ###Input: - First-line will contain 4 space separated integers $a$, $b$, $x$ and $y$ respectively. ###Output: Print the answer in a new line. ###Constraints - $1 \leq a, b, x, y \leq 10^3$

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solution.cppC++17

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