21 lines
346 B
C
21 lines
346 B
C
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#include <stdio.h>
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int main(void){
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int numbers,i;
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unsigned long long n[50] = {3};
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unsigned long long count = 2, cut = 0;
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for(i = 1; i < 50; i++){
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cut = count - cut;
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count *= 2;
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n[i-1] = cut*3;
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}
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while(scanf("%d",&numbers) == 1){
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if(numbers == 1){
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printf("3\n");
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continue;
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}
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printf("%llu\n",n[numbers-2]);
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}
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return 0;
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}
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