/*
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf("Hello world!\n");
return 0;
}
*/
/*
int main() {
int a, b, c;
scanf("%d %d", &a, &b);
c = a+b;
printf("%d+%d=%d\n", a, b, c);
return 0;
}
*/
/*
int main() {
int a;
scanf("%d",&a);
printf("%d",a);
return 0;
}
*/
/*
int main() {
int a;
scanf("%d", &a);
printf("%d%%", a );
return 0;
}*/
/*
int main(){
int a;
scanf("%d", &a);
printf("%d", a );
return 0;
}
*/
/*
int main(){
int a, b, c;
scanf("%d %d", &a, &b);
c=a+b;
printf("%d+%d=%d\n", a, b, c);
c=a-b;
printf("%d-%d=%d\n", a, b, c);
c=a*b;
printf("%d*%d=%d\n", a, b, c);
c=a/b;
printf("%d/%d=%d", a, b, c);
return 0;
}
*/
/*
int main (){
int a, b, c;
scanf("%d", &a);
b=24;
c=a*b;
printf("%d",c);
return 0;
}
*/
/*
int main() {
int a, b;
scanf("%d %d", &a, &b);
printf("%lf\n", (double)a / b);
printf("%d", a%b);
}
*/
/*
int main(){
int a, b, c;
scanf("%d %d %d", &a, &b, &c);
printf("%.2lf\n", (double)(a+b+c)/3);
return 0;
}
*/
/*
int main(){
int a, b;
scanf("%d %d", &a, &b);
printf("%d", a%b);
}
*/
/*
int main(){
int a;
scanf("%d", &a);
printf("%d %d", a/60, a%60);
return 0;
}
*/
int main() {
int a;
scanf("%d", &a);
printf("%.3lf", (double)9/5*a+32);
return 0;
}