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#include <cstdio>
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using namespace std;
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int a[60];
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int main()
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{
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a[1]=1,a[2]=2,a[3]=3;
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for(int i=4;i<60;i++)
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a[i]=a[i-1]+a[i-3];
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int n;
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while(scanf("%d",&n),n)
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printf("%d\n",a[n]);
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return 0;
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}
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