#include <stdio.h>
#include <string>
#include <cstring>
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <list>
#include <iterator>
#include <assert.h>
#pragma warning(disable:4996) 
 
typedef long long ll;
#define MIN(a, b) ((a)>(b)? (b): (a))
#define MAX(a, b) ((a)<(b)? (b): (a))
#define LINF 9223300000000000000
#define INF 2140000000
const long long MOD = 1000000007;
using namespace std;


int main(int argc, char* argv[])
{
    char buffer[256];
    size_t len;

    if (fgets(buffer, 256, stdin) == NULL || buffer[0] == '\n') {
        return 1;
    }
    int n;
    int chk = sscanf(buffer, "%d", &n);
    if(chk!=1 || n!=3) {
        return 5;
    }

    int a[3];
    int i;
    for(i=0; i<3; i++) {
        if (fgets(buffer, 256, stdin) == NULL || buffer[0] == '\n') {
            return 1;
        }
        int len=strlen(buffer);
        int k;
        for(k=0; k<len; k++) {
            if(buffer[k]==' ') {
                printf("\"assert\"\n");
                return 0;
            }
        }
        sscanf(buffer, "%d", &a[i]);
    }
    sort(a+0, a+3);

    int ans=(a[0]==a[1]? a[0]+a[1]: a[0]+a[2]);
    printf("%d\n", ans);

    return 0;
}