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    include

    include

    using namespace std;

    int max_of_four(int x , int y , int z , int s){ int max = 0 ; if (x>max && x> y && x> z && x>s){ max = x; } else if (y > max && y >z && y>s){ max = y;

    }
    else if (z > max && z> s){
        max = z;
    }
    else {
        max =  s;
    }
    return max;
    

    }

    int main() { int a, b, c, d; scanf("%d %d %d %d", &a, &b, &c, &d); int ans = max_of_four(a, b, c, d); printf("%d", ans);

    return 0;
    

    }