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OI-codes/Luogu/problem/P2911/P2911.cpp

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// RR36448329
#include <bits/stdc++.h>
using namespace std;
int s1, s2, s3;
int main() {
scanf("%d%d%d", &s1, &s2, &s3);
if(s3 > s1 + s2) {
printf("%d", s1+s2+1);
} else if(s2 > s1 + s3) {
printf("%d", s1+s3+1);
} else if(s1 > s3 + s2) {
printf("%d", s3+s2+1);
} else {
printf("%d", (s1+s2+s3+3)/2);
}
return 0;
}