#include <stdio.h>
int main() {
int Album, Figuras, i, j, Diferenca=0;
scanf("%d", &Album);
scanf("%d", &Figuras);
int n[Figuras];
for(i=0; i<Figuras; i++){
scanf("%d", &n[i]);
for(j=0; j<i; j++){
if(n[j]!=n[i]){
Diferenca=Diferenca+1;
}
}
if(Diferenca==j){
Album=Album-1;
}
Diferenca=0;
}
printf("%d", Album);
return 0;
}
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