#include
int main()
{
int i = 1,sum = 0;
do
{
sum +=i++;
}while(i <= 100);
printf("1+2+...+100 = %d\n",sum);
return 0;
}
#include
int main(void)
{
int n,sum=0,mul=1,i=1,j;
scanf("%d",&n);
do
{
for(j=1;j<=i;j++)
{
mul*=j;
}
i++;
sum+=mul;
mul=1;
}while(i-n<=0);
printf("sum is %d\n",sum);
return 0;
}
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