#include <stdio.h>
int main()
{
int n = 0, i = 0, m = 0;
int max = 0, min = 0;
scanf("%d",&n);
scanf("%d",&m);
max = m, min = m;
for (i = 0; i < (n-1); i++)
{
scanf("%d",&m);
if(m >= max)
max = m;
if(m <= min)
min = m;
}
printf("%d",(max-min));
return 0;
}

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