gistfile1.c

#include <stdio.h>

int main()
{
int x=0;
int y=1;
int ans=0;
while(y<4000000)
{
    int temp=y+x;
    
    x=y;
    y=temp;
    if(temp%2==0)
        ans+=temp;
}
printf("%i\n",ans);
}