#include<stdio.h>
#include<string.h>

void convertSpeed(char *conversionType, float speed) {
    if (speed < 0) {
        printf("Invalid input\n");
        return;
    }
    
    if (strcmp(conversionType, "KMH_TO_MPH") == 0) {
        float mph = speed * 0.621371;
        printf("%.2f\n", mph);
    } else if (strcmp(conversionType, "MPH_TO_KMH") == 0) {
        float kmh = speed * 1.60934;
        printf("%.2f\n", kmh);
    } else{
        printf("Invalid input\n");
    }
}
int main(){
    char conversionType[20];
    float speed;
    scanf("%s %f", conversionType, &speed);
    convertspeed(conversionType, speed);
    return 0;
}