#include <stdio.h>

int main(){

int a;
scanf("%d", &a);

if(a > 40){a = 100; }
else if(a > 20){a =  80 + 1 * (a - 20); }
else if(a > 10){a =  60 + 2 * (a - 10); }
else{a = 6 * a; }
printf("%d", a);

return 0;
}