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#include <stdio.h>
#include <stdlib.h>
#define C 211
int main()
{
int n,i,o,j;
char d[3][C+1];
freopen("nunta.in","r",stdin);
freopen("nunta.out","w",stdout);
scanf("%d",&n);
for(i=0; i<=C; i++)
d[0][i]=d[1][i]=d[2][i]=0;
d[1][C]=1;
d[2][C]=2;
for(i=3; i<=n; i++)
{
for(int j=0; j<=C; j++)
d[i%3][j]=0;
o=0;
for(j=C; j>0; j--)
{
d[i%3][j]=d[(i-1)%3][j]+d[(i-2)%3][j]+o;
o=d[i%3][j]/10;
d[i%3][j]%=10;
}
}
i=0;
while(d[n%3][i]==0)
i++;
while(i<=C)
printf("%d",d[n%3][i++]);
return 0;
}