#include <stdio.h>
int acc(int x)
{
int static scount=0,ans=0;
if(x == -1)
{
return ans;
}
else if(x == -2)
{
return scount;
}
else if(x >= 0)
{
ans += x;
scount++;
return ans;
}
else
{
return -1;
}
}
int main(void)
{
return 0;
}
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