View Code of Problem 73

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

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