a+b+c+d

Problem Description

Given four integers $a$, $b$, $c$, $d$. You need to output:

• in the first line - the value of $a$,
• in the second line - the sum $a + b$,
• in the third line - the sum $a + b + c$,
• in the fourth line - the sum $a + b + c + d$.

Input Format

The input contains four integers $a$, $b$, $c$, $d$, separated by spaces. Each number does not exceed $1000$ in absolute value.

Output Format

Output the corresponding answers on each line.

1 2 3 4

1
3
6
10

2 0 2 5

2
2
4
9