#include<stdio.h>
int main()
{
int n;
int a;
while(scanf("%d",&n)!=EOF)
{


if(n<=10)
{printf("%d\n",6*n);}
else if(n>10&&n<=20)
{printf("%d\n",60+2*(n-10));}
else if(n>20&&n<=40)
{printf("%d\n",80+(n-20));}
else
{printf("\n");}

}
return 0;

}

最後else要輸出100