#include <stdio.h>
#include <stdlib.h>
#include <math.h>
 
 
 
int main()
{
    float f(float d,float y,float m,float e);
    float a,b,c,d,S;
    printf("Write 4 elements: ");
    scanf("%f%f%f%f",&a,&b,&c,&d);
    S=f(a,b,c,d);
    printf("Result = %10f",S);
    return 0;
}
 
 
float f(float d,float y,float m,float e){
    return (pow(e,(-d*y)))/(d*(4*d*y+m));
}