测评结果

代码如下:

#include<bits/stdc++.h>
using namespace std;
long long n,ans;
void dg(int t,int sum){
	if(sum>n){
		return;
	}
	if(sum==n){
		ans++;
		return;
	}
	dg(1,sum+1);
	dg(2,sum+2);
}
int read(){
    int b=0,d=1;char c;
    while(!isdigit(c=getchar()))if(c=='-')d=-1;
    do b=b*10+c-'0';
    while(isdigit(c=getchar()));
    return b*d;
}
signed main(){
	n=read();
	dg(1,0);
	printf("%d",ans);
	return 0;
}