#include <stdio.h>
#define MAX 6
 
int main(void) {
	int vet1[MAX];
	int vet2[MAX / 2];
	for (int i 
= 0; i 
< MAX
; i
++) scanf("%d", &vet1
[i
]); 	for (int i = 0; i < MAX / 2; i++) vet2[i] = vet1[i * 2] + vet1[i * 2 + 1];
	for (int i 
= 0; i 
< MAX 
/ 2; i
++) printf("%d\n", vet2
[i
]); }
 
//https://pt.stackoverflow.com/q/157593/101
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