#include<stdio.h>
 int main()
{
    int elem, sum = 0;
    int ch;
    while(1) {
        scanf("%d", &elem);
        if(elem%2 == 0) {
            sum += elem;

        }
        if((ch = getchar()) == '\n') {
            break;
    }
    }
    printf("%d\n", sum);
    return 0;
}
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