include<stdio.h>

int main(){ double a,b; scanf("%.1lf",&a); if(a<=150){ b=a0.4463; printf("%.1lf",b);} if(a>151&&a<=400){ b=a0.4663; printf("%.1lf",b);} if(a>401){ b=a*0.5663; printf("%.1lf",b);} return 0;