#include<stdio.h>
int main() {
	double x;
	scanf("%lf",&x);
	int y=(int)x;
	int a=(x-y)*10;
	int b=y/100;
	int d=y%10;
	int c=y/10-b*10;
	printf("%d.%d%d%d",a,d,c,b);
	return 0;
	
}