/*
#include <stdio.h>
int main()
{
int i,j,n;
scanf("%d",&n);
for(i=n;i>=1;i--)
{
for(j=1;j<i;j++)
{
printf(" ");
}
for(j=1;j<=n;j++)
{
printf("*");
}
printf("\n");
}
return 0;
}
*//*
못 품
#include <stdio.h>
int main()
{
int i,j,h,k;
char d;
scanf("%d %d %c",&h,&k,&d)
if(d=='L')
{
for(i=1;i<=h;i++)
{
for(j=1;j<i;j++)
{
printf(" ");
}
for(j=1;j<=k;j++)
{
printf("*");
}
printf("\n");
}
}
else if(d=='R')
{
for(i=h;i>=1;i--)
{
for(j=1;j<i;j++)
{
printf(" ");
}
for(j=1;j<=k;j++)
{
printf("*");
}
printf("\n");
}
}
return 0;
}
*//*
#include <stdio.h>
int main()
{
int i,sum=0,n,j;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
for(j=1;j<=i;j++)
{
sum+=j;
}
}
printf("%d",sum);
return 0;
}
///삼각형 출력방법 ㅑ
///1+
///1+2+
///1+2+3+
///1+2+3+4+
///1+2+3+4+5
///곱하기 출력
///1*5+2*4+3*3+4*2+5*1
///=5+8+9+8+5
///=13+17+5
///=30+5
///=35
*/