#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	int i, j;
	long long int a[3];
	char c[3];
	scanf("%c", &c[0]);
	for (i = 0; i < n; i++)
		scanf("%lld%c", &a[i], &c[i]);
	if (c[0] == ' ' || c[1] == ' ' || c[2] == ' ')
	{
		printf("\"assert\"\n");
		return 0;
	}
	if (a[0] < a[1])
	{
		a[0] ^= a[1];
		a[1] ^= a[0];
		a[0] ^= a[1];
	}
	if (a[0] < a[2])
	{
		a[0] ^= a[2];
		a[2] ^= a[0];
		a[0] ^= a[2];
	}
	if (a[1] < a[2])
	{
		a[1] ^= a[2];
		a[2] ^= a[1];
		a[1] ^= a[2];
	}
	if (a[1] == a[2])
		printf("%lld\n", a[1] + a[2]);
	else
		printf("%lld\n", a[0] + a[2]);
	return 0;
}