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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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long i,j, n,len=0,p;
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long a[10000]= {0};
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a[0]=1;
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scanf("%ld",&n);
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//һ<><D2BB><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><C4B3><EFBFBD><EFBFBD><EFBFBD>
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for(i=1; i<=n; i++) {
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//ÿһλ<D2BB><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>i
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for(j=0; j<=len; j++)
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a[j]*=i;
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p=0;
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//<2F><><EFBFBD><EFBFBD>ÿһλ
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while(p<=len) {
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//ÿ<>ν<EFBFBD>һλ
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if(a[len]>9) {
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len++;
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}
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a[p+1]+=a[p]/10;//ȡ<><C8A1><EFBFBD><EFBFBD>λ
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a[p]=a[p]%10; //ȡ<>ౣ<EFBFBD><E0B1A3>
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p++;
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}
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}
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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for(i=len; i>=0; i--)
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printf("%ld",a[i]);
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return 0;
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}
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