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- #include <bits/stdc++.h>
- using namespace std;
- #define PB push_back
- #define ZERO (1e-10)
- #define INF (1<<29)
- #define CL(A,I) (memset(A,I,sizeof(A)))
- #define DEB printf("DEB!\n");
- #define D(X) cout<<" "<<#X": "<<X<<endl;
- #define EQ(A,B) (A+ZERO>B&&A-ZERO<B)
- typedef long long ll;
- typedef long double ld;
- typedef pair<ll,ll> pll;
- typedef vector<int> vi;
- typedef pair<int,int> ii;
- typedef vector<ii> vii;
- #define IN(n) int n;scanf("%d",&n);
- #define FOR(i, m, n) for (int i(m); i < n; i++)
- #define REP(i, n) FOR(i, 0, n)
- #define F(n) REP(i, n)
- #define FF(n) REP(j, n)
- #define FT(m, n) FOR(k, m, n)
- #define aa first
- #define bb second
- void ga(int N,ll *A){F(N)scanf("%lld",A+i);}
- ll A[3];
- int sl(){
- ll S(*A),L(0);
- F(3)A[i]-=S;
- if(A[1]*2>=A[2])return S+(A[2]+A[1])/3;
- L=A[1],A[2]-=2*L;
- return L+S+min(S,A[2]/3);
- }
- int main(void){
- ga(3,A),sort(A,A+3);
- printf("%d\n",sl());
- return 0;
- }
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