a,b,c=input() a,b,c,d=int(a),int(b),int(c) if a>b>c and b>c: print(a+b+c) elif a>b>c and c>b: print(a+c+d) elif b>a>c and a>c: print(b+a+c) elif b>c>a and c>a: print(b+c+a) elif c>b>a and b>a: print(c+b+a) else: print(c+a+b)