let input = require('fs').readFileSync('/dev/stdin', 'utf8');
const S = input.split('\n')[0].split(/\s/).map(v => Number(v));
S.splice(S.indexOf(Math.max(...S)),1);
S.splice(S.indexOf(Math.min(...S)),1);
const ans = S.reduce((a, b) => a + b) / S.length;
console.log(ans.toFixed(2));