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Cod sursa(job #449013)
#include <cstdio>
#include <cstring>
#define modulo 666013
using namespace std;
int n,i;
int mat[3][3], sol[3][3];
void mult(int A[][3], int B[][3], int C[][3]) {
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
for (int k = 0; k < 2; k++)
C[i][j] = (C[i][j] + 1LL * A[i][k] * B[k][j]) % modulo;
}
void lg_put(int p, int m[][3]) {
int C[3][3], AUX[3][3], i;
memcpy(C, MAT, sizeof(MAT));
M[0][0] = M[1][1] = 1;
for (i = 0; (1 << i) <= P; i++) {
if (P & (1 << i)) {
memset(AUX, 0, sizeof(AUX));
mult(M, C, AUX);
memcpy(M, AUX, sizeof(AUX));
}
memset(AUX, 0, sizeof(AUX));
mult(C, C, AUX);
memcpy(C, AUX, sizeof(C));
}
}
int main()
{
freopen ("kfib.in","r",stdin);
freopen ("kfib.out","w",stdout);
scanf("%d",&n);
mat[0][0]=0;
mat[0][1]=1;
mat[1][0]=1;
mat[1][1]=1;
lg_put(n,sol);
printf("%d",sol[1][1]);
return 0;
}