#include <stdio.h>
//0
 int max(int var[],int a)
{
int maxel,i;
maxel=var[0];
for (i=1;i<a;i++)
if (maxel < var[i])
    maxel=var[i];
return maxel;
}
//1
 int min(int var[],int a)
{
int minel,i;
minel=var[0];
for (i=1;i<a;i++)
if (minel > var[i])
    minel=var[i];
return minel;
}
//2
int diff(int var[],int a)
{
int max1=max(var, a);
int min1=min(var, a);
int diff1=max1-min1;
return diff1;
}
//3
int sum(int var[],int a)
{
int i, indmin,sum;
sum=0;
int min1=min(var, a);
for (i=(a-1);i>=0;i--)
    if (var[i] == min1)
        indmin=i;
for (i=0;i<indmin;i++)
    sum=sum+var[i];
return sum;
}
int main()
{
int var[100], i, j, nf; char c;
scanf("%d", &nf);
printf ("%d\n", nf);
c=' ';
i=0;
while (c != '\n')
    {
    scanf("%d%c", &var[i], &c);
    i++;
    }
if ((nf > 3) || (i > 100))
    {
    printf("%s\n", "Данные некоректны");
    return 0;
    }
if (nf == 0)
    printf("%d\n", max(var, i));
if (nf == 1)
    printf("%d\n", min(var, i));
if (nf == 2)
    printf("%d\n", diff(var, i));
if (nf == 3)
    printf("%d\n", sum(var,i));
return 0;
}