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    include

    using namespace std;

    int max_of_four(int a, int b, int c, int d){ int max= a>b ? a:b; if(c>max)max=c; return d>max ? d: max; } /* Add int max_of_four(int a, int b, int c, int d) here. */

    int main() { int a=3, b=4, c=6, d=5; cin>>a>>b>>c>>d;

    cout<<max_of_four(a,b,c,d)<<endl;
    return 0;
    

    }