#include #include #include using namespace atcoder; using mint = modint1000000007; using namespace std; #define rep(i,n) for (int i = 0; i < (n); ++i) #define Inf 1000000001 int main(){ int t = 30000; int N; cin>>N; vector G(N),D(N); rep(i,N)cin>>G[i]>>D[i]; int ind = 0; rep(i,N){ if(G[ind]-D[ind]*t