Score : $200$ points
We have $A$ cards, each of which has an integer $1$ written on it. Similarly, we also have $B$ cards with $0$s and $C$ cards with $-1$s.
We will pick up $K$ among these cards. What is the maximum possible sum of the numbers written on the cards chosen?
Input is given from Standard Input in the following format:
$A$ $B$ $C$ $K$
Print the maximum possible sum of the numbers written on the cards chosen.
2 1 1 3
Consider picking up two cards with $1$s and one card with a $0$. In this case, the sum of the numbers written on the cards is $2$, which is the maximum possible value.
1 2 3 4
2000000000 0 0 2000000000