#include <stdio.h>
int main(){
double r;
double x1;
if (scanf("%lf",&x1)!=EOF){
if (x1==0.0){r=0.0;}
else{r=1.0/x1;}
printf("f(%.1lf) = %.1lf",x1,r);
}else{
printf("input wrong");
}
return 0;
}
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