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#include <bits/stdc++.h>
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using namespace std;
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int n, m, k, x;
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int main() {
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cin >> n >> m >> k >> x;
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double y = pow(10, k);
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cout << (x + (int)y * m) % n << endl;
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return 0;
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}
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/*
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ѧϰ<EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>https://blog.csdn.net/wwwasdirine/article/details/49430131
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ÿһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0<EFBFBD><EFBFBD>λ<EFBFBD>õ<EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߵ<EFBFBD>m<EFBFBD><EFBFBD>λ<EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˼<EFBFBD><EFBFBD><EFBFBD>ڶ<EFBFBD>Ӧ<EFBFBD><EFBFBD>ͼ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD>m<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>ĿҪ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD>m<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD>%n<EFBFBD><EFBFBD><EFBFBD>ǵ<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD>10^k<EFBFBD><EFBFBD>Ӧ<EFBFBD>þͿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˰<EFBFBD>
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*/
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