#include <iostream>
#include <math.h>
using namespace std;
int main(int argc, char const *argv[])
{
int n = 0;
long sum = 0;
scanf("%d",&n);
for (int i=1;i<=n;i++){
int m = 1;
for(int j=1;j<=i;j++) {
m*=j;
}
sum +=m;
}
printf("%ld",sum%1000000);
return 0;
}
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