#include<stdio.h>
int sum(int i)
{
int k=0;
while(i)
{
k+=i;
i--;
}
return k;
}
int main()
{
int a;
while(1 == scanf("%d",&a))
printf("%d\n\n",sum(a));
return 0;
}
#include<stdio.h>
int sum(int i)
{
int k=0;
while(i)
{
k+=i;
i--;
}
return k;
}
int main()
{
int a;
while(1 == scanf("%d",&a))
printf("%d\n\n",sum(a));
return 0;
}
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