#include<cstdio> #include<iostream> #include<cstring> using namespace std; const int maxn = 110; int n, dp[maxn]; int main(void){ dp[1] = 1; dp[2] = 2; dp[3] = 3; for(int i = 4; i <= 60; ++i) dp[i] = dp[i - 1] + dp[i - 3]; while(scanf("%d", &n) && n){ printf("%d\n", dp[n]); } }
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