#include<stdio.h>
int main(){
	double f,c1;
	int c;
	scanf("%d",&c);
	c1=(double)c;
	double k=9.0/5.0;
	f=k*c+32;
	printf("%.2f",f);
	return 0;
}
/**************************************************************
	Problem: 1031
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/