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10 lines
174 B
C++
10 lines
174 B
C++
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#include <math.h>
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#include <stdio.h>
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int main(void)
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{
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int n;
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while (scanf("%d", &n) != EOF)
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printf("%.0f\n", 3 * pow(2, n - 1) - 2);
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return 0;
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}
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