45 lines
801 B
C++
45 lines
801 B
C++
#include<cstdio>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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void times(int a[8][8],int b[8][8],int t[8][8])
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{
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memset(t,0,256);
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for(int r=0;r<8;r++) for(int c=0;c<8;c++)
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{
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for(int k=0;k<8;k++) t[r][c]+=a[r][k]*b[k][c];
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t[r][c]%=1000;
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}
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}
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int n;
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int a[8][8]={
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{0,1,0,0,0,0,0,1},
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{1,0,1,0,0,0,0,0},
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{0,1,0,1,0,0,0,0},
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{0,0,1,0,0,0,0,0},
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{0,0,0,1,0,1,0,0},
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{0,0,0,0,0,0,1,0},
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{0,0,0,0,0,1,0,1},
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{1,0,0,0,0,0,1,0}
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},b[8][8],c[8][8];
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void ksm(int a[8][8],int b[8][8],int tmp[8][8],int n)
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{
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memset(b,0,256);
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for(int i=0;i<8;i++) b[i][i]=1;
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for(;n;n>>=1)
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{
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if(n&1) { times(b,a,tmp); memcpy(b,tmp,256); }
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times(a,a,tmp); memcpy(a,tmp,256);
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}
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}
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d",&n);
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ksm(a,b,c,n);
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printf("%d\n",b[4][0]);
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return 0;
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}
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