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13 lines
227 B
C++
13 lines
227 B
C++
#include<stdio.h>
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int main(){
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int i,n;
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__int64 a[100];
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while(scanf("%d",&n)==1){
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a[1]=2;
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for(i=2;i<=n;i++){
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a[i]=3*a[i-1]+2;
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}
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printf("%I64d\n",a[n]);
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}
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}
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