#include <iostream>
using namespace std;
#define MAX(A,B) ((A)>(B)?(A):(B))
int main() {
int a,b,c;
cin >>a>>b>>c;
int max = MAX(a,MAX(b,c));
cout << (max < a+b+c-max ? a+b+c : 2*(a+b+c-max)-1);
}
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