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#include<bits/stdc++.h>
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using namespace std;
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int main()
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{
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const int MOD = 1000000;
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int i, n;
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long long S = 0;
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scanf("%d", &n);
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for( i = n; i >= 1; i-- )
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S = (S + 1) * i % MOD;
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printf("%lld\n", S);
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return 0;
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}
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