#include<stdio.h>

int main(){
    int weight;
    int speed;
    float balance;
    float tilt;
    
    if( weight < 0 || speed < 0 || balance < 0 || titlt < 0){
        printf("Invalid input");
    }
    
    int tt = tilt - 0.9;
    int bb = balance * speed;
    int res = bb / tt
    printf("%d", res);
    return 0;
}