48 lines
674 B
C++
48 lines
674 B
C++
#include<iostream>
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#include<string>
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using namespace std;
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void swap(string &a,string &b)
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{
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string c;
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c=a;
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a=b;
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b=c;
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}
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void eraseZero(string &a)
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{
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while(a[0]=='0'&&a.size()>1) a.erase(0,1);
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}
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string add_(string a,string b)
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{
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string c;
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int ai,bi,j=0,x;
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eraseZero(a);
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eraseZero(b);
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if(b.size()>a.size()) swap(a,b);
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for(ai=a.size()-1,bi=b.size()-1;bi>=0;bi--,ai--)
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{
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x=j+a[ai]+b[bi]-2*'0';
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c=char('0'+x%10)+c;
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j=x/10;
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}
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while(ai>=0)
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{
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x=j+a[ai]-'0';
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c=char('0'+x%10)+c;
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j=x/10;
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ai--;
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}
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if(j) c="1"+c;
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eraseZero(c);
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return c;
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}
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int main()
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{
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string ans="1";
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int n;
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cin>>n;
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for(int i=0;i<n;i++) ans=add_(ans,ans);
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cout<<ans<<endl;
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return 0;
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}
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