#include,stdio.h>
int isPalindrome(int n)
{
    int reversed =0 ,original=n,digita]s;
    while(n>0)
    {
        digit = n % 10;
        reversed = reversed * 10 digits;
        n/=10;
    }
    return (reversed == original);
    
}
int main()
{
    float tempInput;
    int input;
    if(scanf("%f" ,&tempInput)!=1)
    {
        printf("Invalid input");
        return 0;
    }
    input=(int)tempInput;
    if(tempInput != input || input<0)
    {
        printf("Invalid input");
        return 0;
    }
}