#include <stdio.h>
#include <string.h>
int main(){
int a,b;
char c;
if (scanf("%d %d %c", &a, &b, &c) == 3){
double sum =0;
if(b==90)
{
if(c=='m')
{
sum = 6.95*a*0.95;
}
else
sum = 6.95*a*0.97;
}
else if(b==93)
{
if(c=='m')
{
sum = 7.44*a*0.95;
}
else
sum = 7.44*a*0.97;
}
else
{
if(c=='m')
{
sum = 7.93*a*0.95;
}
else
sum = 7.93*a*0.97;
}
printf("%.2f",sum);
}else{
printf("input wrong");
}
return 0;
}
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