Some projects--monkeys eat peach problem

Title Description
The monkey eats the peach question. The monkey picked a few peaches on the first day, ate half of it immediately, and ate one more. The next morning he ate half the remaining peaches and ate one more. Every morning after eating the rest of the day half of the zero one. When I want to eat in the morning of the nth day, I see only one peach left. Find out how many peaches you picked on the first day.

Input
N

Output
Total Peaches

Sample input
10
Sample output
1534

Answer

#include <iostream>usingnamespacestd;int main(){    int n,i,m=1;    cin>>n;    for(i=n-1;i>0;i--)        m=(m+1)*2;    cout<<m;    return0;}

Purely mathematical problem, but my maths is not good ....

Some projects--monkeys eat peach problem