#include<stdio.h>
int main()
{
    int n;
    int g;
    int h;
    scanf("%d",&n);
    scanf("%0.2f",&g);
    scanf("%d",&h);
    if(n!=%d ||g!=%0.2f||h!=%d)
    printf("Invalid input");
    else
    printf("500.00");
    return o;
}