View Code of Problem 73

#include<stdio.h>
int main()
{
	int n;
	while (scanf("%d",&n)!=EOF)
	{
		int sum = 1;
		for (int i = 1; i < n; i++)
		{
			sum = (sum + 1) * 2;
		}
		printf("%d\n", sum);
	}
	return 0;
}

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