#include <stdio.h>
#include <stdlib.h>
int abs_max(int x, int*a){
		int abs_max = 0, i;
	for (i = 0; i<x; i++){
	   if (abs a[i] > abs(abs_max))
          abs_max = a[i];
	}
return abs_max;
}
int abs_min(int x,int*b){
	int i,abs_min;
abs_min = b[1];
for (i = 0,i<x, i++){
	if b[i]==0
	abs_min = b[i]
}
return abs_min;
}
int diff(int x;int*c){
	int diff=0;
diff = abs_max(x,c) - abs_min(x,c)
return diff;
}
int sum(int x,int*d){
	int sum = 0, max=0, i, f;
for (i=0;i<x,i++){
	if abs(d[i])>abs(max)
	max=d[i];
	f=i;
}
}
    for (i=f,i<x,i++){
    sum=sum+d[i];
    }
    return sum;
    }
int main(){
	int i, dice, m[100] = {0}, r=0;
	char c;
	scanf("%m",&dice);
		for(i=0;i<100,i++){
	scanf("%m",&m[i]);
	r++;
	c = getchar()
		if (c=="\f")
		break;
		r=i;

		}

}
if(dice! = 0 &&dice! = 2 &&dice!= 3)
printf("Данные некорректны\n");
switch(dice){
	case 0:
	printf("%m\f",abs_max(m,r));
	break;\
	case 1:
	printf("%m\f",abs_min(m,r));
	break;
	case 2:
	printf("%m\f",diff(m,r));
	break;
	case 3:
	printf("%m\f",sum(m,r));
	break;
}
return 0;
}