#include <stdio.h>
#include <math.h>
#include <stdlib.h>
float f,x,a,b,c,k,dx;
int main()
{
scanf ("%d %d %d %d %d %d",&x
,&a
,&b
,&c
,&k
,&dx
); while ((x<=k) && (c!=0))
{
if ((x<0)&&(b!=0))
else
if ((x>0) && (b=0))
f=(x/(x-c))+5.5;
else
f=x/(-c);
x+=dx;
}
return 0;
}
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