#include <stdio.h>
int main ( int argc , char * argv[] ) {
int n , k;
int i;
int fact[13];
fact[0] = 1;
fact[1] = 1;
for ( i = 2 ; i < 13 ; i++ ) {
fact[i] = i * fact[i-1];
}
while ( scanf("%d%d" , &n , &k) != EOF ) {
int c = fact[n];
int t;
for ( i = 0 ; i < k ; i++ ) {
scanf("%d" , &t);
c /= fact[t];
}
printf("%d\n" , c);
}
return 0;
}
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