#include <stdio.h>
double f(double x){return 4*x+5;}
double fi(double y){return (y-5)/4;}
int main()
{
double x,y;
int x1,x2;
int i;
int n;
printf("n >");
scanf("%d",&n);
for(i=1;i<=n*10;i++)
x=i/10.0;
printf("x=%fの時 y=%f\n",x,f(x));
}
y=f(n)*0.3;
x=fi(y);
x1=(int)(x*10);
x2=(int)((x+0.09)*10);
printf("y=%f の時 x=%f",y,x1/10.0);
if(x1!=x2)printf(" , %f",x2/10.0);
printf("\n");
return 0;
}