#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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