Let's odd code coach problem in C

Question

My code failed in case 4 and 5.
What's the problem in my code?
Please help

#include <stdio.h>

int main() {
int a,b=0;
while(scanf("%d",&a)!=EOF){
if(a%2==0){
b+=a;
}
}printf("%d",b);
return 0;
}

Answer 1

Read the description again:
"The first input denotes the length of the list (N)."
You don't have tu add the first number.

Answer 2

Kevin Star Thanks！I will see the question clearly next time😂

Answer 3

Marcin Wiśniewsk Don't spam.