Score : $100$ points

Problem Statement

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.

Constraints

• $1 \leq A \leq 1$ $000$
• $1 \leq B \leq 1$ $000$
• $1 \leq C \leq 1$ $000$
• $1 \leq D \leq 1$ $000$
• All input values are integers.

Input

Input is given from Standard Input in the following format:

$A$

$B$

$C$

$D$

Output

Print the minimum total fare.

600
300
220
420

520

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

755

549
817
715
603

1152