#include<iostream> int main(){ double zl,fy,tou_kg,two; scanf("%lf",&zl); if(zl<=10) fy=zl*2.5; if(zl>10){ tou_kg=10*2.5; fy=(zl-10)*1.5+tou_kg+8.2; } printf("%.1lf",fy); return 0; }