Question: In which countries did the track start out at the top of the "Billboard" hot 100?
About the article "Part of Me (Katy Perry song)", section "Abstract".

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"Butterflies" entered the "Billboard" Hot 100 chart in early November 2001, at number sixty.
The single eventually peaked at number fourteen on the "Billboard" Hot 100 in late 2001.
The track also charted within the top ten, peaking at number two, on the "Billboard" Hot R&B/Hip-Hop Songs chart on January 26, 2002; the song was held from the top position from Ja Rule and Ashanti's "Always on Time" 2001 single.
In 2002, "Butterflies" also peaked at number thirty-six on the "Billboard" Top 40 Mainstream chart.
The track, which was released as a promotional single internationally, did not chart on any music charts outside of the United States. 
The album's title track was a Top 40 hit single, peaking at #25 on the Billboard Hot 100 and #2 on the Billboard Mainstream Rock Tracks chart.
The second-single was "My Paradise", which peaked at #72 on the Billboard Hot 100, not achieving the success expected of it. 
The first track on the album "You Can't Be a Beacon If Your Light Don't Shine" was released in May 1974 as the album's lead single.
The song became Fargo's first #1 single on the "Billboard Magazine" Hot Country Singles chart since 1972, while also peaking at #57 on the Billboard Hot 100, and #14 on the Hot Adult Contemporary Tracks chart.
On the Canadian "RPM" Country Singles chart, the song also reached #1, while also peaking at #41 on the "RPM" Top Singles Chart, and #15 on the "RPM" Adult Contemporary Singles chart.
"US of A" was released as the album's second single in October 1974, peaking at #9 on the "Billboard Magazine" Hot Country Singles chart and #86 on the Billboard Hot 100.
The third and final single spawned from the album was "It Do Feel Good" in February 1974, which peaked at #7 on the "Billboard" country chart and #98 on the Billboard Hot 100 chart.
Both singles did not enter any Canadian chart lists.
"Miss Donna Fargo" was officially released in 1974, and peaked at #4 on the "Billboard" Top Country Albums chart, becoming Fargo's final studio release to chart in the Top 10. 
Chart performance.
United States.
"I'm Real" debuted at 66 on the U.S. "Billboard" Hot 100 on the week ending July 7, 2001, earning the "Hot Shot Debut of the Week" title and debuting on the "Billboard" Hot 100 Airplay at 55.
"I'm Real" jumped to 40 in its second week on the Hot 100 and moved up to 32 on the Hot 100 Airplay chart.
In its third week, the song continued to steadily increase, reaching 25 on the Hot 100 and 20 on the Hot 100 Airplay chart.
By its fourth week, the song had reached the top twenty, fueled by increasing airplay.
On September 8, 2001, "I'm Real" replaced Alicia Keys' "Fallin'" as the leader of both the "Billboard" Hot 100 and Hot 100 Airplay chart.
"I'm Real" spent the next three charting weeks at the summit and was subsequently knocked out of the top spot by "Fallin'", which boasted an additional three consecutive weeks at number one.
After three weeks stalled at number two, "I'm Real" returned to number one again for a final two weeks, through October 27, 2001.
"I'm Real (Murder Remix)" was a staple on R&B/hip hop and pop radio during the summer and fall of 2001, spending fifteen weeks in the top five of the "Billboard" Hot 100.
In 2009 the single was named the 30th most successful song of the 2000s, on the "Billboard" Hot 100 Songs of the Decade.
The chart position of the Murder Remix was boosted by radio play of the album track, which led to complaints of unfairness and change of "Billboard" policy in 2002.
Afterwards, airplay of identically named songs but with substantially different melodies was not combined when computing chart positions.
Lopez's follow-up was "Ain't It Funny (Murder Remix)", another Ja Rule-featured remix, which also reached number one on the Hot 100. 
Although the song did not chart on the "Billboard" Hot 100 due to the chart rules at the time, the song was a significant radio hit in the US.
It spent five weeks at #2 on the "Billboard" Hot 100 Airplay chart and a total of 59 weeks on this ranking.
It also was the first song to top these three "Billboard" airplay charts: Hot Mainstream Rock Tracks, Hot Modern Rock Tracks, and Hot Adult Top 40 Tracks.