45 lines
949 B
C++
45 lines
949 B
C++
#include<iostream>
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#include<cstring>
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using namespace std;
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short x[5][2008];
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int main()
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{
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int n,i,j;
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while(cin>>n)
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{
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if(n<=4)
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{
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cout<<1<<endl;
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continue;
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}
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memset(x,0,sizeof(x));
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x[1][0]=1;
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x[2][0]=1;
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x[3][0]=1;
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x[4][0]=1;
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for(i=5;i<=n;++i)
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{
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memset(x[i%5],0,sizeof(x[i%5]));
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for(j=0;j<=2005;++j)
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{
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x[i%5][j]+=x[(i-1)%5][j]+x[(i-2)%5][j]+x[(i-3)%5][j]+x[(i-4)%5][j];
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if(x[i%5][j]>=10)
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{
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x[i%5][j+1]+=x[i%5][j]/10;
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x[i%5][j]%=10;
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}
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}
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}
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i=2005;
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while(x[n%5][i]==0)
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--i;
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while(i>=0)
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{
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cout<<x[n%5][i];
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--i;
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}
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cout<<endl;
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}
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return 0;
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}
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