main() int N = 10, count = 0, z = 5, i; int m[N]; double res = 0
for(i = 0, i < N, i++) if ((m[i] >= -3) && (m[i] <= 3)) { count++; res = res + m[i]; }
if (count == 0) res = 0; else res = res / count;
if (res > z) { res = 0; for(i = 0; i < N; i++) if (m[i] % 2 == 0) res = res + m[i]; } else { res = 1; for(i = 0; i < N; i++) if (m[i] % 2 != 0) res = res * m[i]; }
var x,t,k,s:real;
begin
read(x,y,k);
s:=x+y+k;
s:=s/3;
writeln(s);
end.