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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 i,n,num=0;
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int s0=0,s1;
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cin>>n;
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for(i=1;i<=n;i++)
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{
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cin>>s1;
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if(s1>s0)
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{
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num+=s1-s0;
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}
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s0=s1;
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}
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cout<<num;
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return 0;
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}
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