3/10>3/15
3/11>3/15
3/12>3/15
3/13>3/15
3/14>3/15
=>S>3/15*5=15/15=1
3/11<3/10
3/12<3/10
3/13<3/10
3/14<3/10
=>3/11+3/12+3/13+3/14+3/10<3/10*5=15/10=3/2<2
=>1<S<2
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