#include<stdio.h>
#include<ctype.h>
int main(){
    char a[15];
    int speed;
    scanf("%s\n%d",a,&speed);
    if(speed<0){
        printf("Invalid input");
    } else if(strcmp(a,"KMPH_TO_MPH")==0){
        printf("%.2f",speed*0.621371);
    } else if(strcmp(a,"KPH_TO_KMH")==0){
        printf("%.2f",speed*1.60934);
    } else {
        printf("Invalid input");
    }
    return 0;
}