#include<stdio.h>
int main()
{
char a;
int m,n;
double h;
scanf("%c",&a);
scanf("%d %d",&m,&n);
if(a=='G'){
h=n+0.5m;
if(h>=100)
printf("100");
else
printf("%.1lf",h);}
else if(a=='B'){
h=1.1m+0.6*n;
if(h>=100)
printf("100");
else
printf("%.1lf",h);
}
else
printf("Wrong input");
return 0;
}