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31 lines
420 B
C++
31 lines
420 B
C++
#include <algorithm>
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#include <iostream>
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#include <iomanip>
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#include <cstring>
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#include <cstdio>
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#include <stack>
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#include <ctime>
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#include <cmath>
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#include <queue>
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typedef long long l;
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typedef double d;
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using namespace std;
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int a,b,c,e;
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int f(int n){
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if(n==1){
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return a;
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}
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if(n==2){
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return b;
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}
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if(n==3){
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return c;
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}
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return f(n-1)+f(n-2)+f(n-3);
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}
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int main(){
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cin >>a>>b>>c>>e;
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cout <<f(e);
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return 0;
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}
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