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21 lines
310 B
C++
21 lines
310 B
C++
#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 <ctime>
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#include <cmath>
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using namespace std;
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int main(){
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long long a,b,c,d,sum=0;
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scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
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for(int i=1;i<=a;i++){
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sum+=b;
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if(i%c==0){
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b+=d;
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}
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}
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printf("%lld",sum);
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return 0;
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}
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