用函数，不迷路！

#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    cout << min(a, min(b, min(c, d)));
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    cout<<min(min(min(a,b),c),d);
    return 0;
}

#include<iostream>
#include<algorithm>
using namespace std;
int a[4];
int main()
{
    for(int i = 0;i < 4;i++)
    {
        cin >> a[i];
    }
    sort(a , a + 4);
    cout << a[0];
    return 0;
}