#include <cstdlib>
#include <cstdio>
int main(void)
{
int n, suma =0;
scanf("%d", &n);
int a[n];
for(int i = 0; i < n ; i++)
scanf("%d", &a[i]);
for(int i = 0; i< n; i++)
{
if(a[i]!=13)
suma +=a[i];
if(a[i]==13 && a[i+1]!=13)
i++;
}
printf("%d\n", suma);
return EXIT_SUCCESS;
}
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