45 lines
763 B
C++
45 lines
763 B
C++
#include <iostream>
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#define INF 1<<30
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#define MAX(a,b) a>b?a:b
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#define MIN(a,b) a<b?a:b
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#include <math.h>
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using namespace std;
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int f(int a,int b,int c)
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{
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int mark=0;
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int sum1,sum2,sum3;
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sum1=sum2=sum3=INF;
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if((a-b)%3==0)
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{
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mark=1;
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sum1=MAX(a,b);
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}
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if((a-c)%3==0)
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{
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mark=1;
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sum2=MAX(a,c);
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}
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if((b-c)%3==0)
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{
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mark=1;
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sum3=MAX(b,c);
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}
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if(mark==0)
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return 0;
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else
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return MIN(MIN(sum1,sum2),sum3);
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}
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int main()
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{
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int y,b,r,sum;
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while(cin>>y>>b>>r)
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{
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sum=f(y,b,r);
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if(sum==0)
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cout<<"):"<<endl;
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else
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cout<<sum<<endl;
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}
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return 0;
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}
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