#include using namespace std; int main() { double a,b; scanf("%lf",&a); if(a<=1) b=1.5a; else b=1.51+(a-1)*2.3; printf("%.2lf\n",b); return 0; }

#include<bits/stdc++.h> using namespace std; int main () { double x,y; scanf("%lf",&x); if(x<=1) y=1.5x; if(x>1) y=1.5+(1.5+0.8)(x-1); { printf("%.2f\n",y);return 0;} return 0; }