#include<stdio.h>
#include<math.h>
int?main()
{
int?n,m,k;
double?i;
while(~scanf("%d?%d?%d",&n,&m,&k))
{
if(n?<=?5?&&?n?>=?1?&&?m?<=?5?&&?m?>=?1?&&?k?<=?5?&&?k?>=?1)
{
i?=??k?/?(n?+?m?+?k)?*?(k-1)?/?(?n?+?m?+?k?-?1);
printf("%.2lf\n",i);
}
}
return?0;
?}
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