Score : $100$ points
You planned a trip using trains and buses. The train fare will be $A$ yen (the currency of Japan) if you buy ordinary tickets along the way, and $B$ yen if you buy an unlimited ticket. Similarly, the bus fare will be $C$ yen if you buy ordinary tickets along the way, and $D$ yen if you buy an unlimited ticket.
Find the minimum total fare when the optimal choices are made for trains and buses.
Input is given from Standard Input in the following format:
$A$ $B$ $C$ $D$
Print the minimum total fare.
600 300 220 420
The train fare will be $600$ yen if you buy ordinary tickets, and $300$ yen if you buy an unlimited ticket. Thus, the optimal choice for trains is to buy an unlimited ticket for $300$ yen. On the other hand, the optimal choice for buses is to buy ordinary tickets for $220$ yen.
Therefore, the minimum total fare is $300 + 220 = 520$ yen.
555 555 400 200
549 817 715 603