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#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false); //读入输出优化的强迫症
int a, b, c;
cin >> a >> b >> c;
int d = a + b + c;
float e = d * 1.0 / 3;
//设置输出为小数点后3位
cout << fixed << setprecision(3);
cout << e << endl;
return 0;
}