welcome

/*
LANG : C
*/
#include <stdio.h>
int main()
{
    int n,a=0,b=0;
    scanf("%d",&n);
    b+=n%100;
    a=n;
    a-=b;
    a/=100;
    if(a>=100) a/=10;
    //printf("%d %d\n",a,b);
    printf("%d",a*a-b*b);
    return 0;
}