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#include <stdio.h>
#include <stdlib.h>
int cmp(const void *x, const void *y)
{
return *(int *) x - *(int *) y;
}
int main()
{
FILE *f = fopen("INP.TXT", "r");
int n, i, *a, r = 1;
fscanf(f, "%d", &n);
a = malloc(n * sizeof(int));
for (i = 0; i < n; i++)
fscanf(f, "%d", a + i);
fclose(f);
qsort(a, n, sizeof(int), cmp);
for (i = 1; i < n; i++)
if (a[i] > a[i - 1])
r++;
f = fopen("OUT.TXT", "w");
fprintf(f, "%d\n", r);
fclose(f);
return 0;
}
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