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#include<bits/stdc++.h>
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using namespace std;
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int main() {
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int K;
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cin>>K;
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double S=0.00000;
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//知识点1：INT_MAX
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//知识点2：整数转浮点数
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for(int n=1; n<INT_MAX; n++) {
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S+=1/(n*1.0);
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if(S>K) {
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cout<<n<<endl;
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break;
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}
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}
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return 0;
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}
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