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#include <bits/stdc++.h> using namespace std; double a,b,c,ans; double maxx(double a,double b,double c){ if(a>=b && a>=c) return a; else if(b>=a && b>=c) return b; else if(c>=a && c>=b) return c; } int main() { scanf("%lf %lf %lf",&a,&b,&c); ans=maxx(a,b,c)/(maxx(a+b,b,c)*maxx(a,b,b+c)); printf("%.3f",ans); return 0; }