1032

#include<stdio.h>
#include<math.h>
int main()
{
    int a;
    scanf("%d",&a);
    if(a<=10000)
     printf("%.2f",1500+a*0.05);
    else if(a>10000&&a<=50000)
     printf("%.2f",1500+(a-10000)*0.03+10000*0.05);
    else if(a>50000)
     printf("%.2f",(a-50000)*0.02+3200);
     
    return 0;
}